Question

Solve x2+7x=18 by factoring.

Answer 1

(x+9)(x-2)

Explanation:

set the equation equal to 0. so x²+7x-18=0

x times x is x², 9 times -2 is -18, and 9 + -2 is 7

Answer 2

solutions {-9, 2}

Explanation:

Please, use " ^ " to denote exponentiation.

x^2+7x=18 should be rewritten in standard form as x2 + 7x - 18 = 0.

Note that (9)(-2) = -18, and that 9 - 2 = 7.

These results are helpful.

Thus, our x^2 + 7x - 18 = 0 factors as follows: (x + 9)(x - 2) = 0.

Setting each factor = to 0 separately, we get the solutions {-9, 2}