Question

How do you evaluate `2s^3+r-t` given r=-3, s=4, t=-7?

Answer 1

`124`

Explanation:

Given the expression:
`color(white)("XXX")2color(red)s^3+color(blue)r-color(green)t`
with
`color(white)("XXX")color(red)(s=4)`
`color(white)("XXX")color(blue)(r=-3)`
`color(white)("XXX")color(green)(t=-7)`

The expression becomes:
`color(white)("XXX")2(color(red)4)^3-(color(blue)(-3))+(color(green)(-7))`

`color(white)("XXX")=128+3-7`

`color(white)("XXX")=124`