Question

What is the value of - 6 x³ - y² - 3 x y if x = -2 and y = 4?

Answer 1

56

Explanation:

Substitute -2 for x. We get:

-6(-2)^3 - y^2 - 3(-2)y, or 48 - y^2 + 6y.

Next, substitute 4 for y: We get:

48 - 16 + 24 = 72 - 16 = 56

Answer 2

56

Explanation:

- 6 x³ - y² - 3xy

`-6*(-2)^(3)-(4)^(2) -3*(-2)(4)`

48-16+24=56