(3х-4)^2 - ( 5х-2)(5х+2)= (3x-4)(3x-4)-(5x-2)(5x+2) = (9x2-12x-12x+16)-(5x-2)(5x+2) = 1(9x2-12x-12x+16)+(-25x2-10x+10x+4) = 9x2-12x-12x+16+(-25x2-10x+10x+4) = 9x2-12x-12x+16-25x2-10x+10x+4 = – 16x2 – 24x + 20
(3х-4)^2 - ( 5х-2)(5х+2)= (3x-4)(3x-4)-(5x-2)(5x+2) = (9x2-12x-12x+16)-(5x-2)(5x+2) = 1(9x2-12x-12x+16)+(-25x2-10x+10x+4) = 9x2-12x-12x+16+(-25x2-10x+10x+4) = 9x2-12x-12x+16-25x2-10x+10x+4 = – 16x2 – 24x + 20