Question

What is the product of (x − 3) and (x + 7)?

Answer 1

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           What is the product of (x-3) and (x+7)?

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          First multiply the x's:-

x•x=x²

Now multiply x times 7:-

7x

So we have

x²+7x

Now multiply -3 times x:-

-3x

So we have

x²+7x-3x

Now multiply 7 and -3:-

x²+7x-3x-21

On simplification,

x²+4x-21

Good luck.

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Answer 2

X times X +(-3) times X + X times 7 +(-3) times (7)=x^2 -3x +7x -21
= x ^2 +4x-21