Question

x la puterea 2 -4x+4=0

Answer 1

$x^{2} -4x+4=0$
(x+2)²=0
x+2=0
x=-2

Answer 2

$\displaystyle x^2-4x+4=0 \\ a=1,b=-4,c=4 \\ \Delta=b^2-4ac=(-4)^2-4 \cdot 1 \cdot 4=16-16=0 \\ x_1=x_2=- \frac{b}{2a} =- \frac{-4}{2 \cdot 1} =- \frac{-4}{2}=-\left(- \frac{4}{2} \right)=-(-2)=2$