devlopper puis simplifier a=7-4(x-2) b=(x-2)(3x+2) c=(x-5)² factoriser E=(2x+7)(x-1)+2(x-1) F=x²-9

développer
a=7-4(x-2)=-4x+15
b=(x-2)(3x+2)=3x²-4x-4
c=(x-5)²=x²-10x+25

factoriser
E=(2x+7)(x-1)+2(x-1)=(x-1)(2x+9)
F=x²-9=(x-3)(x+3)

A=7-4(x-2)
=7-4x+8
=-4x+15

B=(x-2)(3x+2)
=3x²+2x-6x-4
=3x²-4x-4

C=(x-5)²
=x²-10x+25

E=(x-1)(2x+7+2)
=(x-1)(2x+9)

F=(x+3)(x-3)