Just plug in the values. Use PEMDAS
2(4)^2 - 5(3)
2(16) - 5(3)
32 - 15
17 <----------Answer
No, a function is always a relation. A relation may not always a function but the vice versa is true.
It's like the relationship between a rectangle and a square. A rectangle has 4 right angles and 2 sets of congruent sides while a square has 4 right angles and all sides are congruent. Which means that a rectangle is a square, but a square may not always be a rectangle.
The answer to your question is True.
Step-by-step explanation:
hopefully it makes sense and is visible
:)