Question

If f(x) = 3x + a and f(1) = 7 find a and f(4).

Answer 1

answer.............


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Answer 2

As it is given that

$f(x) = 3x + a \\ \\ and \\ \\ f(1) = 7 \\ \\ f(1) = 3(1) + a = 7 \\ \\ 3 + a = 7 \\ \\ a = 7 - 3 \\ \\ a = 4$
Now to find f(4)

$f(x) = 3x + 4 \\ \\ f(4) = 3(4) + 4 \\ \\ = 12 + 4 \\ \\ f(4) = 16$
Hope it helps you.