(x+3)=(1-2x)²
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(x+3)=(1-2x)²(x+3)=(1-2x)²(x+3)=(1-2x)²x+3=1-4x+4x²4x²-5x=2x²-5x/2=1/2
(x+3)=(1-2x)²
(x+3)=(1-2x)²
(x+3)=(1-2x)²
x+3=1-4x+4x²
4x²-5x=2
x²-5x/2=1/2
x²-5x/2+25/16=1/2+25/16
(x-5/4)²=33/16
x-5/4=±√33/4
x=(5-√33)/4,x=(5+√33)/4