Question

me ajudem prfffff

equação do 2° grau
urgente prf ​

Answer 1

Resposta:

$x^{2}+2y^{2}=18\\2y^{2}=18-x^{2}\\y^{2}=\frac{18-x^{2}}{2}\\y=\sqrt{9}-\sqrt{\frac{x^{2}}{2}}\\y=3-\frac{x}{\sqrt{2}}\\\\x-y=-3\\x-(3-\frac{x}{\sqrt{2}})=-3\\x\sqrt{2}-3\sqrt{2}+x\sqrt{2}=-3\sqrt{2}\\2x\sqrt{2}=-3\sqrt{2}+3\sqrt{2}\\2x\sqrt{2}=0\\\boxed {x=0}\\\\x-y=-3\\0-y=-3\\\boxed {y=3}\\\\Provando;\\x^{2}+2y^{2}=18\\0+2*(3)^{2}=18\\2*9=18$

Explicação passo-a-passo: