Question

If x=6 and y=-2, what is the value of `3xy+2x^2-y^3`?

Answer 1

`44`

Explanation:

Substituting `color(red)(6)` for `x` and `color(blue)(-2)` for `y` gives:

`3color(red)(x)color(blue)(y) + 2color(red)(x)^2 - color(blue)(y)^3 ->`

`(3 xx color(red)(6) xx color(blue)(-2)) + (2 xx color(red)((6)^2)) - (color(blue)(-2))^3 ->`

`(-36) + (2 xx 36) - (-8) ->`

`-36 + 72 + 8 ->`

`44`