Bonsoir,
Développer:
A= (7x-3)(-8x-7)= -56x²+24x-49x+21= -56x²-25x+21
B= -(9x-6)(-4x-3)+(-4x-7)=-(-36x²+24x-27x+18)-4x-7= -(-36x²-3x+18)-4x-7
= 36x²+3x-18-4x-7= 36x²-x-25
C= (x+8)²+(10x-1)²= x²+8x+8x+64+100x²-10x-10x+1= 101x²-4x+65
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Bonsoir,
Développer:
A= (7x-3)(-8x-7)= -56x²+24x-49x+21= -56x²-25x+21
B= -(9x-6)(-4x-3)+(-4x-7)=-(-36x²+24x-27x+18)-4x-7= -(-36x²-3x+18)-4x-7
= 36x²+3x-18-4x-7= 36x²-x-25
C= (x+8)²+(10x-1)²= x²+8x+8x+64+100x²-10x-10x+1= 101x²-4x+65