Répondre :
a.4(x²+8x+16)=2(2x²-x-3)
4x²+32x+64=4x²-2x-6
4x²+32x+64-4x²+2x+6=0
34x+70=0
34x= -70
x= -(35/17)
b. 4x²+4x+1=4x²-1
4x²+4x+1-4x²+1=0
4x+2=0
4x= -2
x= -1/2
c.4(x²+2x+1)=2(2x²-x-3)
4x²+8x+4=4x²-2x-6
4x²+8x+4-4x²+2x+6=0
10x+10=0
10x= -10
x= -1