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Y = 3X^2 + 18X + 15

set to zero

3X^2 + 18X + 15 = 0

divide through by 3

X^2 + 6X + 5 = 0

now easy factor by inspection

(X + 1)(X + 5)

X = -1

X = -5

-1 checks by inspection and I assume -5 will check also

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Q: What is the answer for y equals 3x squared plus 18x plus 15?
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