(2x + 5)² = (x - 1)(x³+x²+x+1) = (x+1)(x³-2²+x-1) =

(2x+5)²= =2x²+20x²+25= =22x²+25=47x² (x-1)(x³+x²+x+1)= =x-1+x³-x²-x-1= =x-1 =-1x (x+)(x³-2²+x-1)= =x+1+x³-4+x-1 =x³-4 =-4x³