Final answer:
When substituting x = 3 and y = -2 into the expression 2x^2 - y, the result is 2(3)^2 + 2, which simplifies to 20.
Step-by-step explanation:
To simplify the expression 2x^2 - y with the given values x = 3 and y = -2, we substitute these values into the expression.
Substitution step:
- 2(3)^2 - (-2)
- 2(9) + 2
- 18 + 2
- 20
The simplified value of the expression, when x is 3, and y is -2, is 20.