Question

2.(x-3)²=(-3)²-1
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Answer 1

\(\Leftrightarrow\left(x-3\right)^2=4\)

\(\Leftrightarrow\left[{}\begin{matrix}x-3=2\\x-3=-2\end{matrix}\right.\Leftrightarrow x\in\left\{5;1\right\}\)

Answer 2

⇔[x−3=2x−3=−2⇔x∈{5;1}

Answer 3

2.(x-3)²=(-3)²-1
2.(x-3)²= 9 - 1
2.(x-3)²= 8
   (x-3)²=8 : 2
   (x-3)²= 4
   (x-3)² = 2² 
   x - 3 = 2
   x      = 2 + 3
   x = 5