Упростить 2х(х-4)-(х+5)^2

Question

Упростить 2х(х-4)-(х+5)^2

Answer 1

2х( Х - 4 ) - ( Х + 5 )^2 = 2х^2 - 8х - ( х^2 + 10х + 25 ) = 2х^2 - 8х - х^2 - 10х - 25 = х^2 - 18х - 25

Answer 2

2х(х-4)-(х+5)² = 2x²-8x-(x²+10x+25) = 2x²-8x-x²-10x-25 = x²-18x-25.