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(x-9)(x+9) find the product

User Covfefe
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1 Answer

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Method 1.

Use
(a-b)(a+b)=a^2-b^2


(x-9)(x+9)=x^2-9^2=x^2-81

Method 2.

Use distributive property: (a + b)(c + d) = ac + ad + bc + bd


(x-9)(x+9)=(x)(x)+(x)(9)+(-9)(x)+(-9)(9)=x^2+9x-9x-81=x^2-81

User LIU YUE
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