9xy2 * 9x5y2 = 81x6y4
9x
5x * 9x = 45x2 =====
( (45) (9x) )
It is equal to -18x^2 +9x
It is: -45x
9x
-9x + 4 = -50 -9x = -50 - 4 -9x = -54 -x = -6 x = 6.
7
9 times a variable x
9x
9x+8
Assuming you mean: (9x × x2)2 Then we can say: = (9x3)2 = 81x6