Question

Resolva essa equação incompleta -2x²+64=0

Answer 1

$-2 x^{2} +64=0 \\ -2 x^{2} =-64 \\ 2 x^{2} =64 \\ x^{2} =64\div2 \\ x^{2} =32 \\ x= \sqrt{32} \\ x= \sqrt{2^5} \\ x=\pm4 \sqrt{2}$