y = 8 − x 2 y = x 2 x = − 3 x = 3 {\displaystyle {\begin{aligned}&\color {red}\mathbf {y=8-x^{2}} &\color {royalblue}\mathbf {y=x^{2}} \\&x=-3&x=3\\\end{aligned}}}
8 − x 2 = x 2 8 = 2 x 2 4 = x 2 {\displaystyle {\begin{aligned}8-x^{2}&=x^{2}\\8&=2x^{2}\\4&=x^{2}\\\end{aligned}}}
x = ± 2 {\displaystyle x=\pm 2}
