Answer:
-5
Step-by-step explanation:
if u add negative and positive of the same numbers the end result is 0
12 to the 2nd power=144
15 to the 2nd power =225
225-144=81
square root of 81 is 9
it would be either 10/x or x/10 depending on the order
Since a and 5 aren't like terms, you would write the expression as
