You need to clarify your question. Depending on what you mean, the answer could be:
or many other things.
125x squared
To multiply (5x) by (x^2), you multiply the coefficients and add the exponents of the variables. The coefficient is 5, and the exponent of (x) in (5x) is 1. So, (5x \times x^2 = 5x^{1+2} = 5x^3).
15
(3x2)2 (5x)4 = 9x4625x4 = 5625x8
Oh, dude, 5 times x squared is just 5x². It's like multiplying 5 by x squared, which is basically x times x. So, yeah, 5x², that's the answer. But hey, don't stress too much about it, math can be a real snooze sometimes, am I right?
5x cubed
125x squared
It is 5x2 - 20
(5x)2 = 25x2.
5x X x^(2) = 5x^(3) ; Said as 'five 'x' cubed'.
To multiply (5x) by (x^2), you multiply the coefficients and add the exponents of the variables. The coefficient is 5, and the exponent of (x) in (5x) is 1. So, (5x \times x^2 = 5x^{1+2} = 5x^3).
When you subtract 7x^2 from 5x^2, you get -2x^2.
(5x - 2y)(5x + 2y)
15
5x squared
-1
5x2 - 20 = 0x2 - 4 = 0x2 = 4x = +2 and -2