3.
a)(x-3)(4x-5+2)=(x-3)(4x-3)
b)(x+5)(2x+7-4)=(x+5)(2x+3)
c)(4x+1)(x-7+6)=(4x+1)(x-1)
d)(7x-1)(x+9-6)=(7x-1)(x+3)
e)(3x-8)(10x-7-1)=(3x-8)(10x-8)=2(3x-8)(5x-4)
f)(6x-5)(1+14x-9)=(6x-5)(14x-8)=2(6x-5)(7x-4)
4.
a)(2x-3)(3-x+4x-1)=(2x-3)(3x+2)
b)(x-2)(4x-15-2+3x)=(x-2)(7x-17)
c)(5x-1)(x+6-4x-5)=(5x-1)(1-3x)
d)(5-3x)(2x-7-x+8)=(5-3x)(x+1)
e)(1-3x)(7x+2+5-2x)=(1-3x)(5x+7)
f)(5-4x)(6x-1-5x-3)=(5-4x)(x-4)
5.
a)(x-4)(3x+1+x-4)=(x-4)(4x-3)
b)(x+6)(1-6x-x-6)=-(x+6)(7x+5)
c)(2x+3)(2x+3-1+8x)=(2x+3)(10x+2)=2(2x+3)(5x+1)
d)(5x-1)(5x-1+4x+7)=(5x-1)(9x+6)=3(5x-1)(3x+2)
e)(5x+3)(10x+6-6x+5)=(5x+3)(4x+11)
f)(4x-3)(7x-5+36x-27)=(4x-3)(43x-32)
6.
a)(x-1)(x+1)
b)(x-2)(x+2)
c)(x-3)(x+3)
d)(x-4)(x+4)
e)(x-5)(x+5)
f)(x-6)(x+6)
g)(x-7)(x+7)
h)(x-8)(x+8)
i)(x-9)(x+9)
