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Solve for x (complex solution)
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y=-5\left(x^{2}+6x+9\right)-2
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(x+3\right)^{2}.
y=-5x^{2}-30x-45-2
Use the distributive property to multiply -5 by x^{2}+6x+9.
y=-5x^{2}-30x-47
Subtract 2 from -45 to get -47.