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(x+2)(x+2)=x²
x²+2x+2x+4=x²
4x= -4
x= -1
b) (x+1)²=x²-1
(x+1)(x+1)=x²-1
x²+x+x+1=x²-1
2x= -2
x= -1
c) (x+4)²=x(6+x)
(x+4)(x+4)= 6x+x²
x²+4x+4x+16=6x+x²
2x= -16
x= -8
d) (3x+2)²=x(-2+9x)
(3x+2)(3x+2)= -2x+ 9x²
9x²+6x+6x+4= -2x+ 9x²
14x= -4
x= - 4/14
x= - 2/7
x²+4=x²/√
√4=x
x=2