Answer :

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The solutions of the quadratic equations are listed below:

  1. x₁ = - 1.5, x₂ = - 2
  2. b₁ = 3, b₂ = - 0.8
  3. m₁ ≈ 6.702, m₂ ≈ 0.298
  4. h₁ ≈ 3.908, h₂ ≈ - 1.408
  5. x₁ ≈ 1.333, x₂ = - 2
  6. n₁ ≈ 14.446, n₂ ≈ 0.554
  7. a₁ ≈ - 0.117, a₂ ≈ - 2.133
  8. k₁ ≈ 2.108, k₂ ≈ - 1.708
  9. t₁ = 1.75, t₂ = - 2.5
  10. y₁ ≈ 0.333 + i 1.491, y₂ ≈ 0.333 - i 1.491
  11. q₁ ≈ 2.408, q₂ ≈ - 2.908
  12. x₁ ≈ 8.273, x₂ = - 2.273

How to solve a quadratic equation by using the quadratic formula

In this problem we find quadratic equations of the form a · x² + b · x + c = 0, whose roots can be found analytically by using the quadratic formula:

x = - b / (2 · a) ± [1 / (2 · a)] · √(b² - 4 · a · c), a ≠ 0

Now we proceed to solve each quadratic equation:

1) 2 · x² + 7 · x + 6 = 0

x = - 7 / (2 · 2) ± [1 / (2 · 2)] · √(7² - 4 · 2 · 6)

x₁ = - 1.5, x₂ = - 2

2) 5 · b² - 11 · b - 12 = 0

b = 11 / (2 · 5) ± [1 / (2 · 5)] · √[(- 11)² - 4 · 5 · (- 12)]

b₁ = 3, b₂ = - 0.8

3) m² - 7 · m + 2 = 0

m = 7 / (2 · 1) ± [1 / (2 · 1)] · √[(- 7)² - 4 · 1 · 2]

m₁ ≈ 6.702, m₂ ≈ 0.298

4) 2 · h² - 5 · h - 11 = 0

h = 5 / (2 · 2) ± [1 / (2 · 2)] · √[(- 5)² - 4 · 2 · (- 11)]

h₁ ≈ 3.908, h₂ ≈ - 1.408

5) 3 · x² + 2 · x - 8 = 0

x = - 2 / (2 · 3) ± [1 / (2 · 3)] · √[2² - 4 · 3 · (- 8)]

x₁ ≈ 1.333, x₂ = - 2

6) n² - 15 · n + 8 = 0

n = 15 / (2 · 1) ± [1 / (2 · 1)] · √[(- 15)² - 4 · 1 · 8]

n₁ ≈ 14.446, n₂ ≈ 0.554

7) 4 · a² + 9 · a + 1 = 0

a = - 9 / (2 · 4) ± [1 / (2 · 4)] · √(9² - 4 · 4 · 1)

a₁ ≈ - 0.117, a₂ ≈ - 2.133

8) 5 · k² - 2 · k - 18 = 0

k = 2 / (2 · 5) ± [1 / (2 · 5)] · √[(- 2)² - 4 · 5 · (- 18)]

k₁ ≈ 2.108, k₂ ≈ - 1.708

9) 8 · t² + 6 · t - 35 = 0

t = - 6 / (2 · 8) ± [1 / (2 · 8)] · √[6² - 4 · 8 · (- 35)]

t₁ = 1.75, t₂ = - 2.5

10) 3 · y² - 2 · y + 7 = 0

y = 2 / (2 · 3) ± [1 / (2 · 3)] · √[(- 2)² - 4 · 3 · 7]

y₁ ≈ 0.333 + i 1.491, y₂ ≈ 0.333 - i 1.491

11) 2 · q² + q - 14 = 0

q = - 1 / (2 · 2) ± [1 / (2 · 2)] · √[1² - 4 · 2 · (- 14)]

q₁ ≈ 2.408, q₂ ≈ - 2.908

12) 0.5 · x² - 3 · x - 9.4 = 0

x = 3 / (2 · 0.5) ± [1 / (2 · 0.5)] · √[(- 3)² - 4 · 0.5 · (- 9.4)]

x₁ ≈ 8.273, x₂ = - 2.273

To learn more on quadratic equations: https://brainly.com/question/1863222

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