Question

-2x^2+x+7=-x^2+5x+(-2-x^2)

Answer 1

$-2 x^{2} +x+7=- x^{2} +5x-2- x^{2} -2 x^{2} +x+7=-2 x^{2} +5x-2 4x=9 x=2,25$