Question

Решите уравнения е, ж

Answer 1

е) $(x+7)^{2} +(x-6)^{2}=2x^{2}  \\x^{2} +14x+49+x^{2} -12x+36=2x^{2} \\2x=85\\x=42.5$

ж)$x^{2} -64=0\\x^{2} =64\\x=+-8$