Answer:
x=2
Step-by-step explanation:
We know that
f(x)=2(x+10)
and
f(x)=24
Therefore, by substitution, we can set the 2 expressions equal to each other.
2(x+10)=24
Now, we need to solve for x. Perform the opposite of what is being done to the equation, and remember to perform everything to both sides.
2 and x+10 are being multiplied. The opposite of multiplication is division, so divide both sides by 2.
2(x+10)/2=24/2
x+10=24/2
x+10=12
10 is being added to x. The opposite of addition is subtraction. Subtract 10 from both sides.
x+10-10=12-10
x=12-20
x=2
