Question

What is `x^2+y^2+xyz` if `x=-3, y=5` and `z=4`?

Answer 1

`-26`

Explanation:

What is `color(red)(x^2) + color(blue)(y^2) + color(red)(x)color(blue)(y)color(green)(z)` if `color(red)(x = -3)`, `color(blue)(y = 5)` and `color(green)(z = 4)`

Substituting the values for the variables gives:

What is `color(red)(-3^2) + color(blue)(5^2) + (color(red)(-3) * color(blue)(5) * color(green)(4))`

Doing the calculations gives:

`color(red)(9) + color(blue)(25) - 60 ->`

`34 - 60 -> -26`