Question

Given the function ƒ(x ) = 7x + 2, find x when ƒ(x ) = 31.

Answer 1

Hola

Here is your answer

f(x) = 7x +2

and f(x) = 31

from this we can conclude that

7x + 2 = 31

thus,. 7x = 29

x = 29/7

x = 4.14

Answer 2

Hey mate, here is your answer -:)

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$f(x) = 7x + 2 \\ \\ on \: putting \: f(x) = 31 \\ \\ \: \: \: \: \: \: \: \: 31 = 7x + 2 \\ \\ 31 - 2 = 7x \\ \\\: \: \: \: \: \: \: \: 29 = 7x \\ \\ \: \: \: \: \: \: \frac{29}{7} = x$

$The \: value \: of \: x \: is \: \frac{29}{7}$

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HOPE it helps to you!!!