this equation becomes y = -4x² + 32x which is a quadratic equation that, when graphed, forms an upside down u-shaped curve (upside down because the x² term is negative; if it's positive then the curve is u-shaped)
In a linear function, the highest power of will be . This is not the case here as the highest power of is due to the , which means that the given function cannot be linear. Therefore, the answer is nonlinear. Hope this helps!