ANSWER
The function is non linear.
EXPLANATION
A linear function is of the form
\(y = mx + c\)
or
\(ax + by + c = 0\)
The highest degree of the variables in each term in the simplest form is 1.
Any degree higher or less than 1 will make the function nonlinear.
The function given to us is,
\(y = 2{x}^{2} - 4\)
The highest degree is 2. This is a quadratic curve.
The graph of all linear functions are straight lines.
