Question

Radical din (×-3)²=7
$\sqrt{(x - 3) {}^{2} } = 7$
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Answer 1

Răspuns:

x = -4 ; x = 10

Explicație pas cu pas:

√(x-3)² = 7 <=> Ix-3I = 7  =>

x-3 = 7 => x = 10

-x+3 = 7 => x = -4

Answer 2

$\it \sqrt{(x-3)^2}=7 \Rightarrow |x-3|=7 \Rightarrow x-3=\pm7 \Rightarrow \\ \\ \\ \Rightarrow x-3\in\{-7, \ 7\}\bigg|_{+3} \Rightarrow x\in\{-4,\ 10\}$