Question

va rog,ajutor !!
Exercitiul 19
Multumesc anticipat !

Answer 1

a) (3x+1)(48x²-3)-(23x²+1)(3x+1)=
=(3x+1)(48x²-3-23x²-1)=
=(3x+1)(25x²-4)=
=(3x+1)(5x-2)(5x+2)

b) (4x+3)(37x²-13)-(4x+3)(x²+12)=
= (4x+3)(37x²-13-x²-12)=
= (4x+3)(36x²-25)=
= (4x+3)(6x-5)(6x+5)

c) (63x²-14)(8x+5)-(11-x²)(8x+5)=
=(8x+5)(63x²-14-11+x²)=
=(8x+5)(64x²-25)=
=(8x+5)(8x-5)(8x+5)=
=(8x+5)²(8x-5)

d) (51x²-43)(7x-6)-(7x-6)(2x²-7)=
= (7x-6)(51x²-43-2x²+7)=
= (7x-6)(49x²-36)=
= (7x-6)(7x-6)(7x+6)=
= (7x-6)²(7x+6)