Final answer:
To evaluate f(-2), substitute -2 for x in the given function f(x) = 2x² + 3. To evaluate f(5), substitute 5 for x in the function.
Step-by-step explanation:
To evaluate f(-2), substitute -2 for x in the given function f(x) = 2x² + 3:
f(-2) = 2(-2)² + 3
= 2(4) + 3
= 8 + 3
= 11
To evaluate f(5), substitute 5 for x in the function:
f(5) = 2(5)² + 3
= 2(25) + 3
= 50 + 3
= 53