Question

Please bantuin yaa no 21,22,23 pake caranya ​

Answer 1

21.

ax² + bx + c = 0

x² + x - 2 = 0

a = 1

b = 1

c = - 2

x1 + x2 = - b/a

x1 + x2 = - 1/1

x1 + x2 = - 1

x1x2 = c/a

x1x2 = - 2/1

x1x2 = - 2

1/x1 + 1/x2 = (x1 + x2)/x1x2

1/x1 + 1/x2 = - 1/- 2

1/x1 + 1/x2 = ½ (C)

22.

2x² + 6x - 10 = 0

x1 + x2 = - b/a

x1 + x2 = - 6/2

x1 + x2 = - 3

x1x2 = c/a

x1x2 = - 10/2

x1x2 = - 5

- 2/x1 - 2/x2 = (- 2x1 - 2x2)/x1x2

- 2/x1 - 2/x2 = - 2(x1 + x2)/x1x2

- 2/x1 - 2/x2 = - 2(- 3)/- 5

- 2/x1 - 2/x2 = - 6/5 (A)

23.

- 3x² + 6x + 9 = 0

x1 + x2 = - b/a

x1 + x2 = - 6/- 3

x1 + x2 = 2

x1x2 = c/a

x1x2 = 9/- 3

x1x2 = - 3

x1/x2 + x2/x1 = (x1² + x2²)/x1x2

x1/x2 + x2/x1 = ((x1 + x2)² - 2x1x2)/x1x2

x1/x2 + x2/x1 = ((2)² - 2(- 3))/- 3

x1/x2 + x2/x1 = (4 + 6)/- 3

x1/x2 + x2/x1 = - 10/3 (A)