(х + 2)² - 49 = 0
a² - b² = (a - b)(a + b)
(x + 2)² - 7² = 0
(x + 2 + 7)(x + 2 - 7) = 0
(x + 9)(x - 5) = 0
x₁ = -9
x₂ = 5
√x² = |x|
(х + 2)² - 49 = 0.
(х + 2)² = 7²
|x + 2| = 7
1. x + 2 = 7
x₁ = 5
2. x+2 = -7
x₂ = -9
(х + 2)² - 49 = 0
x² + 4x + 4 - 49 = 0
x² + 4x - 45 = 0
D = b² - 4ac = 16 + 180 = 196
x₁₂ = (-4 +- 14)/2 = -9 5
каким хотите тем и решайте
(х + 2)² - 49 = 0
a² - b² = (a - b)(a + b)
(x + 2)² - 7² = 0
(x + 2 + 7)(x + 2 - 7) = 0
(x + 9)(x - 5) = 0
x₁ = -9
x₂ = 5
√x² = |x|
(х + 2)² - 49 = 0.
(х + 2)² = 7²
|x + 2| = 7
1. x + 2 = 7
x₁ = 5
2. x+2 = -7
x₂ = -9
(х + 2)² - 49 = 0
x² + 4x + 4 - 49 = 0
x² + 4x - 45 = 0
D = b² - 4ac = 16 + 180 = 196
x₁₂ = (-4 +- 14)/2 = -9 5
x₁ = -9
x₂ = 5
каким хотите тем и решайте