15
(3x2)2 (5x)4 = 9x4625x4 = 5625x8
125x squared
8
5x2+56xy+11y2 = (5x+y)(x+11y) when factored
When you subtract 7x^2 from 5x^2, you get -2x^2.
(5x - 2y)(5x + 2y)
5x cubed
-1
5x squared
15
(3x2)2 (5x)4 = 9x4625x4 = 5625x8
No comment
(5x - 11)(2x + 1) if the term in x is negative; (5x + 11)(2x - 1) if it's positive.
(5x-10)(x+3)
125x squared
-15x2+5x=-5x(3x-1)