Which one of the following can be the value of x in the equation \(5 x^2-18=107\)?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 5
The equation has only an \(x^2\) term, so \(x^2\) is found first and then its square root.
\(5x^2=107+18=125\)
\(x^2=25\)
\(x=5\) or \(x=-5\); only 5 is among the options
The value 25 in Option (2) is \(x^2\), not \(x\).