Bonsoir,
Factoriser:
1.M(x) = x* -2x
= x(x-2)
2.N(x) = -1 +4x *
= (2x-1)(2x+1)
3.O(x) = 49-25x*
= (7-5x)(7+5x)= -(5x-7)(5x+7)
4.P(x)= 9x-25x*
= -x(25x-9)
5.Q(x) = (2x-3)(x+2) +x(2x-3)
= (2x-3)(x+2+x)= (2x-3)(2x+2)= 2(2x-3)(x+1)
6.R(x) = (2x-3)* - (x+2)*
= (2x-3-x-2)(2x-3+x+2)= (x-5)(3x-1)
7.S(x)=(1-x)(2x-3)-(1-x)(x+4)
= (1-x)(2x-3-x-4)=(1-x)(x-7)= -(x-1)(x-7)
8.T(x)= (2x-3)* - (2x-3)(x+1)
= (2x-3)(2x-3-x-1)= (2x-3)(x-4)
9.U(x)= 9x* - (x-1)*= (3x-x+1)(3x+x-1)= (2x+1)(4x-1)
