Solve for a
a=15-b^{2}
Solve for b (complex solution)
b=-\sqrt{15-a}
b=\sqrt{15-a}
Solve for b
b=\sqrt{15-a}
b=-\sqrt{15-a}\text{, }a\leq 15
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a=15-b^{2}
Subtract b^{2} from both sides.
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