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rezolvati ecuatia:xpatrat+2x-3=2x+6

Răspuns :

xpatrat+2x-3=2x+6
x patrat-3=3
x patrat=3+3
x patrat=6
x= +-radical din6
x unu =radical din 6
xdoi =-radical din 6
xpatrat+2x-3=2x+6
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x
² + 2x -3 = 2x +6 ⇔ x² = 2x + 6 - 2x +3 ⇔ x² = 9 ⇔ √x²=√9 ⇔

⇔ |x| = 3 ⇔ x = ± 3

x₁ = -3,   x₂ = 3 .