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Question
Answer the following:
If f(x) = 3x + a and f(1) = 7 find a and f(4)
Solution
f(x) = 3x + a
∴ f(1) = 3(1) + a = 3 + a
∴ f(1) = 7 gives
3 + a = 7
∴ a = 4
∴ f(x) = 3x + 4
∴ f(4) = 3(4) + 4 = 16.
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