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SSAAnya11
@SSAAnya11
July 2022
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Решите уравнения, применяя теорему, обратную т.Виета.
[tex] x^{2} -16x+63=0[/tex]
Разложите квадратный трехчлен на множители
а) [tex] x^{2} +9x+20 [/tex]
б) [tex]4 x^{2}+7x-2[/tex]
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nKrynka
X² - 16x + 63 = 0
x₁ * x₂ = 63
x₁ + x₂ = - (-16)
x₁ = 7
x₂ = 9
a) x² + 9x + 20
x₁ = - 4
x₂ = - 5
б) 4x² + 7x - 2 = 0
D = 49 + 4*4*2 = 81
x₁ = (- 7 - 9) / 8
x₁ = - 2
x₂ = (- 7 + 9) / 8
x₂ = 1/4
применим формулу:
ax² + bx + c = a(x - x₁)(x - x₂)
получим:
4x² + 7x - 2 = 4(x + 2)(x - 1/4)
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Answers & Comments
x₁ * x₂ = 63
x₁ + x₂ = - (-16)
x₁ = 7
x₂ = 9
a) x² + 9x + 20
x₁ = - 4
x₂ = - 5
б) 4x² + 7x - 2 = 0
D = 49 + 4*4*2 = 81
x₁ = (- 7 - 9) / 8
x₁ = - 2
x₂ = (- 7 + 9) / 8
x₂ = 1/4
применим формулу:
ax² + bx + c = a(x - x₁)(x - x₂)
получим:
4x² + 7x - 2 = 4(x + 2)(x - 1/4)