Yes, x times x equals x squared.
16 to the 4th power, or 16 x 16 x 16 x 16 = 65,536
No. Cos squared x is not the same as cos x squared. Cos squared x means cos (x) times cos (x) Cos x squared means cos (x squared)
No. x squared is x times x, whereas 2x is x + x.
x cubed, or x³
x squared means x times x. Since x can be any number, x times x can also be any number.
The GCF is xy.
2x to the fourth
x2 + 8x2 = 9x2