Question

–5x2+41x–86 = –3x2+25x–56

Answer 1

$-5x^2+41x-86=-3x^2+25x-56 \\ 0=5x^2-3x^2+25x-41x-56+86 \\ 0=2x^2-16x+30 \\ \\Simplificas:\\(2x^2-16x+30)/2=x^2-8x+15=0 \\ x^2-8x+15=(x-3)(x-5) \\ x-3=0\to x_1=3\\x-5=0\to x_2=5$

Saludos!