Question

What is the value of the expression below when x=4 and y=3?

The question is 5x to the 3rd power plus 4y to the 3rd power

Answer 1

`x = 4\\y = 3`

Question is
`5x^3 + 4y^3`

We know what
`x` and
`y` are.

`5x^3 + 4y^3 = 5 * 4^3 + 4 * 3^3\\= 5 * 64 + 4 * 27\\= 320 + 108\\= 428`