Question

Can someone check my answer i got C.) please help me
Solve for x in the following equation
5x^2-56=0
A.) x= -7 ; 8/5
B.)x=-7 ;8/5
C.) x=7 ;-8/5
D.)x=7;8/5

Answer 1

You sure you typed the problem statement correctly? That should be x = ±sqrt(56/5)

Answer 2

no typed it rigth

Answer 3

Well, none of the answers are correct. You don't even need any fancy quadratic methods for the problem as it's given.

5x^2 - 56 = 0
5x^2 = 56
x^2 = 56/5
x = ±sqrt(56/5)

Answer 4

...so roughly ±3.35