# What is the value of the expression 2x^{2} + 3xy – 4y^{2} when x = 2 and y = –4?

An expression is a combination of terms that are combined by using mathematical operations such as subtraction, addition, multiplication, and division.

## Answer: -80

We will substitute 2 for x and -4 for y in the expression 2x^{2} + 3xy – 4y^{2}

**Explanation:**

2x^{2} + 3xy – 4y^{2} = 2 (2^{2}) + 3 (2) (-4) – 4 (-4)^{2}

= 8 - 24 - 64

= -80