Final answer:
The expression z^4 + 7z^3 - 9y^3 - y^2 evaluates to 884 when substituting z = -6 and y = -5.
Step-by-step explanation:
To evaluate the expression z^4 + 7z^3 - 9y^3 - y^2 when z = -6 and y = -5, we substitute the given values into the expression:
- First, substitute z = -6: (-6)^4 + 7(-6)^3
- Then, substitute y = -5: -9(-5)^3 - (-5)^2
- Calculate each term:
- Now, sum all these terms to get the final result: 1296 - 1512 + 1125 - 25
- The result is 884.
The evaluated expression with z = -6 and y = -5 is 884.