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x²+6x+9-1=x²
6x=-8
x=-4/3
b)4x² -(1-2x)(1-2x)+2x=11
4x²-(1-4x+4x²)+2x=11
4x²-1+4x-4x²+2x=11
6x=12
x=2
c)x(x-1)-4=(x-2)(x+2)-x
x²-x-4=x²-4-x
-4=-4
0=0
d)(x+1)(x+1)(x+1)=x(x²+3x)
x³+3x²+3x+1=x³+3x²
3x=-1
x=-⅓