How do I add polynomials with three variables?

label Algebra
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(x+9)(x-2)+(x-7)

Sep 10th, 2015

(x + 9)(x - 2) + (x - 7)

Now first we do the multiplication, so

(x^2 - 2x + 9x - 18) + (x - 7)

(x^2 + 7x - 18) + (x - 7)

Now we do the rest(addition), we get

x^2 + 7x - 18 + x - 7

x^2 + 7x + x - 18 - 7

x^2 + 8x - 25

Hence.

Sep 10th, 2015

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