Algebra-2

If f(3) = 12, then we can find the function f(x) by plugging x=3 into each of the given options and seeing which of the given function expressions could satisfy this situation.

We need to check each expression:

Option A: f(x) = 2x + 5

When x = 3:

f(x) = 2(3) + 5 = 6 + 5 = 11 (not equal to 12)

Option B: f(x) = 3x

When x = 3:

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