Yes, x times x equals x squared.
yes
x cubed
x times the sum of x and 9 x times (x times 9) x(9x) 9 times x[squared] 9x[squared]
5(x^2 + y)
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)
yes
x squared means x times x. Since x can be any number, x times x can also be any number.
We know that when you submit questions you aren't free to use the right format to make the mathematical terms crystal clear. It is likely that you mean "x squared times 6 plus x squared times 2", which is clearer. You can factor out the "x squared" and you will see that you get "x squared times 8". You COULD mean (6x) squared plus (2x) squared, which would be different. 6x times 6x would equal x squared times 36, so your answer will be much different.
x cubed, or x³
x cubed
x2 + 8x2 = 9x2
x times the sum of x and 9 x times (x times 9) x(9x) 9 times x[squared] 9x[squared]
2x to the fourth
No. x squared is x times x, whereas 2x is x + x.