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prealgebra senior

Problem

If

f (a) = a - 2

and

F (a, b) = b^{2} + a

, then

F (3, f (4))

is:

(A)

a^{2} - 4 a + 7

(B)

28

(C)

7

(D)

8

Solution

We find

f (4) = (4) - 2 = 2

, so

F (3, f (4)) = F (3, 2) = (2)^{2} + 3 = 7

.

Final answer

C