(radical din 3 -2x la puterea 2)=1
Răspunsuri la întrebare
√3 - 2x² = 1
√3 - 1 = 2x²
2x² = √3 - 1
√3 - 1
x² = ---------
2
√3 - 1
x₁;₂ = ± √ -----------
2
√3 - 1
x₁ = √ -----------
2
√3 - 1
x₂ = - √ -----------
2
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(√3 - 2x)² = 1
(a-b)² = a² - 2ab + b²
noi avem:
a= √3
b= 2x
(√3 - 2x)² = 1
√3 ·√3 - 2·√3 · 2x + 4x² = 1
3 - 4√3 x +4x² - 1 = 0
4x² - 4√3 x + 2 =0 | :2
2x² - 2√3 x + 1 =0
a = 2
b= - 2√3
c= 1
Δ = b² - 4ac
Δ = (- 2√3)² - 4·2·1 = 4·3 - 8 = 4
√Δ = √4
√Δ = 2
-b ± √Δ 2√3 ± 2 2(√3 ± 1) ⁽²
x₁;₂ = ------------------ = --------------- = ---------------
2a 2· 2 2· 2
√3 ± 1
x₁;₂ = ------------------
2
√3 + 1
x₁ = ------------------
2
√3 - 1
x₂ = ------------------
2
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[√(3-2x) ]² = 1
√(3-2x) · √(3-2x) = 1
3-2x = 1
- 2x = 1 - 3
- 2x = -2
-2
x = ---------
-2
x = + 1
x=1
(√3 - 2x) ² = 1