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(4x+3+5x-6)(4x+3-5x+6)=
(11x-3)(-x+9)
__________________________
b) W(x) = (2x-7)²-(5x+2)²=
(2x-7+5x+2)(2x-7-5x-2)=
(7x-5)(-3x-9)
_____________________________
c) W(x) = (x-6)²-(2x+1)²=
(x-6+2x+1)(x-6-2x-1)=
(3x-5)(-x-7)
______________________________
d) W(x) = (10x+3)²-(9x-7)²=
(10x+3+9x-7)(10x+3-9x+7)=
(19x-4)(x+10)
______________________________