# Operations with Algebraic Expressions: Multiplication of Polynomials

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1 Operations with Algebraic Expressions: Multiplication of Polynomials The product of a monomial x monomial To multiply a monomial times a monomial, multiply the coefficients and add the on powers with the same variable as a base. Note: A common mistake that many students make is to multiply the on powers with the same variables as a base. This is NOT CORRECT. Remember the exponent rules! Exponent Rules Case What to do Rule Example Multiplying powers with the same base Dividing powers with the same base Simplifying power of a power Exponent of 0 Add the. Keep the base the same. Subtract the. Keep the base the same. Multiply the. Keep the base the same. Anything to the exponent of 0 equals 1. (x a )(x b ) = x a+b (2 5 )(2 3 ) = 2 8 x a = x a x b = x a b 2 = = 2 2 x b 2 3 (x a ) b = x ab (2 5 ) 3 = 2 15 x 0 = = 1 Other cases that come up when working with powers Case What to do Example Adding powers with the same base and SAME Adding powers with the same base and DIFFERENT Subtracting powers with the same base and SAME Subtracting powers with the same base and DIFFERENT The powers are like terms. Add the coefficients; keep the base and the exponent the same. The powers are NOT like terms. They can NOT be added. The powers are like terms. Subtract the coefficients; keep the base and the exponent the same. The powers are NOT like terms. They can NOT be subtracted. x a + x a = 2x a x a + x b = x a + x b 2x a x a = x a x a x b = x a x b

2 Simplify. 5x 3 ( 6x) = 5( 6)x Multiply the coefficients. Add the since both powers have base x. = 30x 4 Simplify. 20a 2 y 3 b ( 1 4 ay4 ) = 20( 1 4 )a2+1 y 3+4 b Multiply the coefficients. Add the for powers with base a. Add the for powers with base y. = 5a 3 yb Example 3: Simplify. 0.10p 10 q 4 (10)p 5 q -4 = 0.10(10)p 10+5 q 4-4 Multiply the coefficients. Add the for powers with base a. Add the for powers with base y. = 1p 15 q 0 Simplify q 0. Any number to the exponent of 0 equals 1. = p 15 (1) p 15 multiplied by 1 is just p 15 = p 15 The product of a monomial x binomial To multiply a monomial by a binomial, multiply the monomial by EVERY term making up the binomial. Remember: To find the product of two terms, multiply the coefficients and add the on powers with the same variable as a base. Expand. 5x 3 (7x xy) 5x 3 (7x xy) Step 1: Multiply the monomial by EVERY term making up the binomial. = 5x 3 (7x 2 ) + 5x 3 (15xy) Step 2: To find the product of two terms, multiply the coefficients and add the on powers with the same variable as a base.

3 = 35x x 4 y Expand. 2c 4 p(10c 3 p 2 4c) 2c 4 p(10c 3 p 2 4c) the Step 1: Multiply the monomial by EVERY term making up binomial. = 2c 4 p(10c 3 p 2 ) + ( 2c 4 p)( 4c) Step 2: To find the product of two terms, multiply the coefficients and add the on powers with the same variable as a base. = 20c 7 p 3 + 8c 5 p The product of a monomial x trinomial OR monomial x polynomial To multiply a monomial by a trinomial or any polynomial, multiply EVERY term in the trinomial or polynomial by the monomial. To find the product of two terms, multiply the coefficients and add the on powers with the same variable as a base. Example: Expand. 7x 3 (19x 7 y x + y) 7x 3 (19x 7 y x + y) the Step 1: Multiply the monomial by EVERY term making up binomial. = 7x 3 (19x 7 y) + 7x 3 (20) + 7x 3 ( 3x) + 7x 3 (y) Step 2: To find the product of two terms, multiply the coefficients and add the on powers with the same variable as a base. = 133x 10 y + 140x 3 21x 4 + 7x 3 y The product of a binomial x binomial To multiply a binomial by a binomial, multiply EVERY term in the first binomial by EVERY term in the second binomial. Then simplify by collecting (adding or subtracting) like terms, if it is possible.

4 You can use the FOIL (First, Outer, Inner, Last) method to remember how to multiply binomials. First Last (a + b)(c + d) = ac + ad + bc + bd Inner Expand. (3x + 2)(5x 2) Outer (3x + 2)(5x 2) Step 1: Use FOIL to multiply every term in the first binomial by every term in the second binomial. = 3x(5x) + (3x)( 2) + (2)(5x) + (2)( 2) Step 2: Evaluate every product. = 15x 2 + ( 6x) + 10x + ( 4) = 15x 2 6x + 10x 4 Step 3: Collect like terms. = 15x 2 + 4x 4 This is the final answer. Expand. (2y 8)(3x 1) (2y 8)(3x 1) Step 1: Use FOIL to multiply every term in the first binomial by every term in the second binomial. = 2y(3x) + (2y)( 1) + ( 8)(3x)+ ( 8)( 1) Step 2: Evaluate every product. = 6yx + ( 2y) + ( 24x) + (8) There are no like terms that can be collected. Simplify double signs. Arrange terms in alphabetical order*. = 6yx 24x 2y + 8 This is the final answer. *Note: By convention, terms are written from highest to lowest degree and in alphabetical order..

5 Squaring a binomial To square a binomial means to multiply the binomial by itself. The rules of multiplying a binomial by a binomial apply. To multiply a binomial by a binomial, multiply EVERY term in the first binomial by EVERY term in the second binomial. When multiplying a binomial by itself, the expanding follows a pattern as shown below. (a + b) 2 = (a + b)(a + b) = a 2 + ab + ab+ b 2 = a 2 + 2ab + b 2 Expand. (5x 3) 2 Solution 1: (5x 3) 2 = (5x 3)(5x 3) Step 1: Use FOIL method to expand. = 25x 2 15x 15x + 9 Step 2: Collect like terms. = 25x 2 30x + 9 Solution 2: (5x 3) 2 = (5x) 2 + 2(5x)( 3) + ( 3) 2 Step 1: Use the (a + b) 2 = a 2 + 2ab + b 2 pattern to expand. (a + b) 2 = a 2 + 2ab + b 2 = 25x 2 30x + 9 Step 2: Simplify each term. Expand. (9y + 2) 2 (9y + 2) 2 = (9y) 2 + 2(9y)(2) Step 1: Use the (a + b) 2 = a 2 + 2ab + b 2 pattern to expand = 81y y + 4 Step 2: Simplify each term.

6 Practice Questions: 1. Simplify each of the following algebraic expressions: a) 3b 2 a( 2b 3 ) b) p 4 r( 21pr 2 ) c) 22a(b 2 a 2b 3 a) d) 19x( y 2 + 3x 3 z) e) 3s(2s + 4qs 2 8) f) 2(11x xy 14y 3 ) g) (28q 3 s 9 + 2q 2 s 10q 5 s q +9) h) (2x + 3)(19x 1) i) (3x + 5)(7 3x) j) (9y 2 + 8)(3y 2) k) (5y 3)(y 3 + 6) l) (8a 3)(9a 10) m) (9x + 2) 2 n) (14 y) 2 o) (x 2 y) 2 p) (4a 3 3b) 2 Answers: 1. a) 6b 5 a b) 21p 5 r 3 c) 22b 2 a 2 44b 3 a 2 d) 57x 4 z 19xy 2 e) 6s qs 3 24s f) 22x 2 40xy + 28y 3 g) 28q 3 s 9 2q 2 s + 10q 5 s 3 18q 9 h) 38x x 3 i) 9x 2 + 6x + 35 j) 27y 3 18y y 16 k) 5y 4 3y y 18 l) 72a 2 107a 30 m) 81x x + 4 n) y 2 28y o) x 4 2x 2 y + y 2 p) 36a 6 24a 3 b + 9b 2

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