Question

5) x² + 7x – 18 = 0
6) x² + 8x - 65 = 0
7) 2x² + 7x – 4 = 0
8) 20x² – 27x = 14

Answer 1

Respuesta:

5) x = -9, x = 2

6) x = -13, x = 5

7) x = -4, x = 1/2

8) x = -2/5, x = 7/4

Explicación paso a paso:

5) x² + 7x – 18 = 0

x +9

x -2

(x + 9)(x - 2) = 0

x + 9 = 0 , x - 2 = 0

x = -9 , x = 2

6) x² + 8x - 65 = 0

x +13

x -5

(x + 13)(x - 5) = 0

x + 13 = 0 , x - 5 = 0

x = -13 , x = 5

7) 2x² + 7x – 4 = 0

2x -1

x +4

(2x - 1)(x + 4) = 0

2x - 1 = 0 , x + 4 = 0

x = 1/2 , x = -4

8) 20x² – 27x = 14

20x² - 27x - 14 = 0

5x +2

4x -7

(5x + 2)(4x - 7) = 0

5x + 2 = 0 , 4x - 7 = 0

x = -2/5 , x = 7/4