Cet. Factor and Solve. x^2 + 3x - 18 = 0

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x = 3 or x = - 6

Step-by-step explanation:

Factor and Solve. x^2 + 3x - 18 = 0

We can use the Diamond method of factoring.

Factor - 18 = 6 * - 3; and 3 = 6 + - 3

so

x^2 + 3x - 18 = x^2 - 3x + 6x - 18 = 0

= (x^2 - 3x) + (6x - 18) = 0

= (x^2 - 3x) + (6x - 18) = 0

= x (x - 3) + 6 * (x - 3) = 0

= (x - 3) * (x + 6) = 0

so Either x - 3 = 0 or x + 6 = 0

x = 3 or x = - 6