Sagot :
A= 25(x-3)² - (2x+1)² =(5(x-3))-(2x+1))(5(x-3))+(2x+1)) =(5x-15-2x-1)(5x-15+2x+1)
(3x-16)(7x-14)
B=3(4x+12)(x+3) - 10(2x+6)(3x+5)=6*2(2x+6)(x+3)- 10(2x+6)(3x+5)=
(2x+6)(12(x+3)-10(3x+5))=(2x+6)(12x+36-30x-50)=(2x+6)(-18x-14)
bonne chance