COPYING IS NOT AT ALL GOOD MY BOY ! TRY TO CHANGE THAT HABIT
y = 2x^2 - 4
Add both side 4
y + 4 = 2x^2 - 4 + 4
y + 4 = 2x^2
Divide both sides by 2
( y + 4 ) ÷ 2 = 2x^2 ÷ 2
y + 4 / 2 = x^2
x^2 = y + 4 / 2
x = + √(y+4/2) Or x = - √(y+4/2)
Thus the second option is the correct answer.
