Question

Find 3x^2 - y^3 - y^3 - z if x = 3, y = -2, and z = -5. Please explain, thank you!

Answer 1

To solve a problem where we already know the value of the variables, we should simply substitute in the value of the variable for every instance of the variable, and then solve like a normal math problem.


`3x^(2) - y^(3) - y^(3) - z \\ 3*3^(2) - ⁻2^(3) - ⁻2^(3) - ⁻5 \\ 3*9 - ⁻8 - ⁻8 - ⁻5 \\ 27 - 5 \\ 22`

Using the math above, we can see that the value of this expression is 22.