Solve for r
r=-x\left(x+24\right)
Solve for x (complex solution)
x=\sqrt{144-r}-12
x=-\sqrt{144-r}-12
Solve for x
x=\sqrt{144-r}-12
x=-\sqrt{144-r}-12\text{, }r\leq 144
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24x+r=-x^{2}
Subtract x^{2} from both sides. Anything subtracted from zero gives its negation.
r=-x^{2}-24x
Subtract 24x from both sides.
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