Lasvegasteacher
Lasvegasteacher Lasvegasteacher
  • 24-01-2022
  • Mathematics
contestada

x^2+3=180
solve for x.

a. -18 and 10
b. -15 and 12
c. -12 and 15
d -10 and 18

Respuesta :

devishri1977
devishri1977 devishri1977
  • 24-01-2022

Answer:

b

Step-by-step explanation:

x² + 3x = 180

x² + 3x - 180 = 0

Sum = 3

Product = -180

Factors = 15 , -12    {15 *(-12) = -180  & 15 + (-12) = 3 }

x² + 15x -12x - 180 = 0

x² + 15x - 12x - 12*15 = 0

x(x + 15) - 12(x + 15) = 0

(x +15)(x - 12) = 0

x + 15 = 0          ;  x -12 = 0

x= -15   ; x = 12

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