Question

Porfa banda 2x²+x-15=0​

Answer 1

Respuesta:

x₁ = -2.5    o x₂ = 3

Explicación paso a paso:

2x² - x - 15 = 0

x = {-(-1)±√((-1²)-(4*2*-15))} / (2*2)

x = {1±√(1+120)}/4

x = {1±√121} / 4

x = {1±11} / 4

x₁ = {1-11) / 4 = -10/4 = -2.5

x₂ = {1+11} / 4 = 12/4 = 3

Comprobación:

x₁

2*-2.5²-(-2.5) - 15 = 0

2*6.25 + 2.5 - 15 = 0

12.5 + 2.5 - 15 = 0

x₂

2*3² - 3 - 15 = 0

2*9 - 3 - 15 = 0

18 - 3 - 15 = 0

Answer 2

2x² + x - 15  = 0​

2x         - 5

x           + 3

6x -5x = x

(2x -5)(x + 3) = 0

2x -5 = 0       x + 3 = 0

2x = 5            x = -3

x = 5/2

CS = (-3; 5/2)

 Eternamente

☆༒ axllxa ༒☆