The value of x if f(x) = 15 in the given function is 3
From the question,
We were given the function f(x) = 2x + 9
To determine the value of x if f(x) = 15, we will put f(x) to be equals to 15 and then solve for x in the equation
That is,
f(x) = 2x + 9
Since f(x) = 15
∴ 15 = 2x + 9
Now, to solve the above equation,
First, subtract 9 from both sides
That is,
15 - 9 = 2x +9 -9
6 = 2x
Then, we can write that
2x = 6
∴ x = 6 ÷ 2
x = 3
Hence, the value of x if f(x) = 15 in the given function is 3
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