A=(2x+1)(3x-1)
= 2x*3x+2x*(-1)+1*3x+1*(-1)
= 6x²-2x+3x-1
= 6x²-1x-1
B= -6(3x-5)
= -6*3x+(-6)*(-5)
= -18x+30
C = 5*2+x-2x²+5x
= 10+x-2x²+5x
= -2x²+6x+10
pour x=-2
x²+3x-4= -2²+3*(-2)-4
= 4-6-4
= -6
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6x au carré + -2x + 3x + -1
6x au carré + 1x + -1
B= -6 × 3x + -6 × -5
-18x + 30
A=(2x+1)(3x-1)
= 2x*3x+2x*(-1)+1*3x+1*(-1)
= 6x²-2x+3x-1
= 6x²-1x-1
B= -6(3x-5)
= -6*3x+(-6)*(-5)
= -18x+30
C = 5*2+x-2x²+5x
= 10+x-2x²+5x
= -2x²+6x+10
pour x=-2
x²+3x-4= -2²+3*(-2)-4
= 4-6-4
= -6