My last problem for you?

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9x(x+2)=0
x=0,-2

9 x ² + 18 x = 0
9x (x + 2) = 0
x = 0 , x = - 2

the answer is
x = 0, x = - 2

you can check the answer by putting the numbers in for x

9x^2 + 18x = 0
x(9x+18) = 0
x(x+2) = 0

x = 0, x = -2

9 x² + 18 x = 0
9 x (x + 2) = 0
9 x = 0 or (x + 2) = 0
x = 0 or x = – 2
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9x^2 + 18x = 0
x(9x+18) = 0
x(x+2) = 0

x = 0, x = -2

9x^2 + 18x = 0 (factor out a 9)
9(x^2 + 2x) = 0 (factor out an x)
9x(x + 2) = 0 (separate the coefficient and parentheses into two equations)

9x = 0 (divide both sides by 9)
x = 0

x + 2 = 0 (subtract 2 from both sides)
x = -2

ANSWER: x = 0, x = -2

9x^2 + 18x = 0
(9x^2 + 18x)/9 = 0/9
x^2 + 2x = 0
x(x + 2) = 0

x = 0

x + 2 = 0
x = -2

∴ x = 0 , -2