SOLUTION: directions: find the roots of the quadratic equation y=x^2+7x-18 by factoring. choose the correct answer. A)7,9 B)9,2 C)-7,-9 D)-9,2. which one is the answer?

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: directions: find the roots of the quadratic equation y=x^2+7x-18 by factoring. choose the correct answer. A)7,9 B)9,2 C)-7,-9 D)-9,2. which one is the answer?      Log On


   

Question 123885: directions: find the roots of the quadratic equation y=x^2+7x-18 by factoring. choose the correct answer. A)7,9 B)9,2 C)-7,-9 D)-9,2. which one is the answer?
Answer by chitra(359) About Me  (Show Source):
You can put this solution on YOUR website!
The given quadratic equation can be written as:

y = x%5E2+%2B+7x+-+18+

Y = x%5E2+%2B+9x+-+2x+-+18

y = x(x + 9) - 2(x + 9)

y = (x - 2)(x + 9)

Thus the soln set is (-9,2)

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