Question

Evaluate x³-2xy² + y³ when x= -2 and y=3​

Answer 1

5

Explanation:

`{x}^(3) - {2xy}^(2) + {y}^(3) \\ {( - 2)}^(3) - 2( - 2)(3) {}^(2) + {3}^(3) \\ - 8 + 4 - 18 + 27 \\ 31 - 26 = 5`

Answer 2

55

Explanation:

1. Substitute in the values

-2^3 - ( 2 * -2 * 3^2 ) + 3^3

2. Simplify the powers

-8 - ( 2 * -2 * 9 ) + 27

3. Solve the brackets

-8 - ( -4 * 9 ) + 27

-8 - ( -36 ) + 27

-8 + 36 + 27

4. Solve

-8 + 63

55