Solve for y
y=-x\left(4x-15\right)
Solve for x (complex solution)
x=\frac{\sqrt{225-16y}+15}{8}
x=\frac{-\sqrt{225-16y}+15}{8}
Solve for x
x=\frac{\sqrt{225-16y}+15}{8}
x=\frac{-\sqrt{225-16y}+15}{8}\text{, }y\leq \frac{225}{16}
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-15x+y=-4x^{2}
Subtract 4x^{2} from both sides. Anything subtracted from zero gives its negation.
y=-4x^{2}+15x
Add 15x to both sides.
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