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(x+2)(x+2)=2x²
x²+4x+4=2x²
-x²+4x+4=0
Δ=16-16=0
x=-b/2a=-4/-2= 2
b)
(1/2x)²+x²=45
5/4x²=45 / *4
5x²=180 / :5
x²=36 / √
x=6