Final answer:
The value of x² +3-y² is 12 when x=-3 and y = 2.
Step-by-step explanation:
To find the value of x² +3-y² when x=-3 and y = 2, substitute the given values of x and y into the expression:
x² + 3 - y²
= (-3)² + 3 - (2)²
= 9 + 3 - 4
= 12
Learn more about Evaluating expressions with given values