a) 34x(9x−1)−43(9x−1)=(9x−1)(34x−43)=
=(9x−1)121(16x−9)=121(9x−1)(16x−9)
b) 25x2(7x+2)+35(7x+2)=(7x+2)(25x2+35)=
=(7x+2)65(3x2+2)=65(7x+2)(3x2+2)
c) 43(5x−3)−65x2(5x−3)=(5x−3)(43−65x2)=
=(5x−3)121(9−10x2)=121(5x−3)(9−10x2)
d) 2x(2x+3)−311(2x+3)=(2x+3)(2x−311)
e) x26(3x−7)+23(3x−7)=(3x−7)(x26+23)
f) 3x3(8x+3)−22(8x+3)=(8x+3)(3x3−22)=
=(8x+3)61(23x−32)=61(8x+3)(23x−32)
g) 5x(2x2+3)−3−2x2=5x(2x2+3)−(2x2+3)=
=(2x2+3)(5x−1)
h) 3x2(4x−3)+2(3−4x)=3x2(4x−3)−2(4x−3)=
=(4x−3)(3x2−2)
i) 10x(9x−6)−2(15x−10)=10x⋅3(3x−2)−2⋅5(3x−2)=
=30x(3x−2)−10(3x−2)=(3x−2)(30x−10)
j) 4x(12x2+20)−5(30x2+50)=4x⋅4(3x2+5)−5⋅10(3x2+5)=
=16x(3x2+5)−50(3x2+5)=(3x2+5)(16x−50)