Respuesta :

Answer: -4

Step-by-step explanation:

3 times that number→3x

Difference of the square of a number and 28→x^2-28

x^2 −28= 3x

-3x =-3x

x^2-3x-28=0

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

x-7=0

x+4=0

x=7  x=-4

{Negative Solution: }-4

Negative Solution: −4