For f (x) = 4x + 7 find (f4)?

For each function what is the output of the given input

Look at the LHS in f(x) = 4x + 7, ie, f(x). Compare it with f(4). You see that we’ve put 4 in place of x.
To find f(4), put 4 in place of x in RHS. Simple.

f(4) = 4 * 4 + 7 = 16 + 7 = 23.

f(x) = 4x+7
f(4) = 4(4) +7
f(4) = 16 + 7
f(4) = 23

23 is the output.

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