How to solve this math equation about Integer and exponents?

[input]-5*(sqrt4(81))-(-3)*2^3 / (-sqrt(9)) - (-1)^0 - 3^2 +8-2^3 * sqrt(4)[/input]

-5*(3)-(-3)*8 / (-3) - 1 - 3^2 +8-8 * 2
-15+24 /(-3) - 1 - 9 +8-16
-15-8 - 1 - 9 +8-16
-15-8 - 1 - 9 +8-16
-41