Question

what is 4x squared times 4x squared? Is it 16x to the fourth power?

Answer 1

4x² * 4x² =    We can change the order of the factors
4 * 4 * x² * x² = 16 * x²⁺² = 16*x⁴ = 16x⁴

Answer 16x⁴

Answer 2

4x^2 + 4x^2 = 4*4*x^2+2 = 16x^4

So, yes, the answer is 16x to the fourth power (16x^4).