Question

x²+3x=28
necesito ayuda por favor ಠಿ_ಠಿ​

Answer 1

x² + 3x - 28 = 0

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

1) x - 4 = 0

x = 4

2) x + 7 = 0

x = -7

Prueba:

(4)² + 3(4) = 28

16 + 12 = 28

28 = 28

(-7)² + 3(-7) = 28

49 + -21 = 28

28 = 28