Question

vaa roggg dauu coroanaa subpunctele a b si c​

Answer 1

Răspuns:

Explicație pas cu pas:

x^2 - 10x + 9 = 0

x^2 - x - 9x + 9 = 0

x(x - 1) - 9(x - 1) = 0

(x - 1)(x - 9) = 0

x1 = 1

x2 = 9

____________

x^2 + 8x + 15 = 0

x^2 + 3x + 5x + 15 = 0

x(x + 3) + 5(x + 3) = 0

(x + 3)(x + 5) = 0

x1 = -3

x2 = -5

____________

3x^2 + 11x + 8 = 0

3x^2 + 3x + 8x + 8 = 0

3x(x + 1) + 8(x + 1) = 0

(x + 1)(3x + 8) = 0

x1 = -1

x2 = -8/3