Question

$\sqrt{2x + 3 } = x$
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Answer 1

Răspuns:

√(2x + 3) = x

• ridicam la patrat pentru a scapa de radical

2x + 3 = x²

x² - 2x - 3 = 0

x² + x - 3x - 3 = 0

x(x + 1) - 3(x + 1) = 0

(x - 3)(x + 1) = 0

x - 3 = 0 ⇒ x₁ = 3

x + 1 = 0 ⇒ x₂ = - 1