Question

Efectuati a) (2x+1)(2x-1)-(2x+1)(2x+1)? b)(x-2)(x-3)-(x-1)(x-5)?? c)(x-1)(x-3)-(x-2)2 ? d)(x+2)(x2-x+3)-(x+1)(x2+2x-5)?? va rog Repedeee!!

Answer 1

a).  (2x+1)(2x-1)-(2x+1)(2x+1) = 4x²-1 - (4x²+4x+1)= 4x²-1-4x²-4x-1=-4x-2=-2(2x+1) ;
b).  = x²-2x-3x+6-x²+x+5x-5 = x+1 ;
c).  = x²-x-3x+3 - x²+4x-4= -1 ;
d).  = x³+2x²-x²-2x+3x+6-x³-2x²+5x-x²-2x+5 = -2x²+4x+11 ;