You can put this solution on YOUR website! If you mean y = x^2 +18x + 9 and you want the zeros of the equation, then
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x^2 +18x +9 = 0 and solve for x
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you could use the quadratic formula or completing the square
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I will use completing the square
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x^2 +18x = -9
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divide 18 by 2 and square it, add result to both sides of =
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x^2 +18x +81 = 72
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(x+9)^2 = 72
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take square root of both sides
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x+9 = 6 * square root (2)
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x = 6 * square root (2) - 9
and
x = (6 * (-square root (2))) - 9
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