3x3 + 15x2 + 18x = 0
This has one obvious solution, x = 0. Also, if you assume x != 0 (x is not equal to 0), and divide everything by 3x:
x2 + 5x + 6 = 0
can be factored to
(x + 2)(x + 3) = 0
So, two other solutions are x = -2, and x = -3.
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The GCF is 15x^2y^2
15x squared plus eleven
9x squared-15x squared = -6
x + 10
x + 5