Hello,
Your answer would be 2, -2.
[tex]8x^2 - 4 = 28[/tex]
[tex]8x^2-4+4=28+4[/tex]
[tex]8x^2 = 32[/tex]
[tex] \frac{8x^2}{8}= \frac{32}{8}
[/tex]
[tex]x^2 = 4[/tex]
x = +/4
x = 2 or x = -2
2 , -2 would be the answer! :)
Mark Brainliest if this helped you :)
