Question

Given the function f(x) = 2(x + 8), find x if f(x) = 12

2

40

−2

14

Answer 1

Substitute 12 for x
..

Answer 2

You mean for f(x)

Answer 3

f(x) = (12) + 8)

Answer 4

Well don't do that....

Answer 5

f(x) = 2(x+8) = 12

Answer 6

12 = 2(x + 8)

Answer 7

Woops, yeah go with hero's

Answer 8

I'm interested in seeing @Tayloresc solve this

Answer 9

I'm so confused by this

Answer 10

If you have f(x) = 2(x + 8) and they tell you f(x) = 12, then replace f(x) with 12:

If you do that you'll have

12 = 2(x+8)

Can you solve that for x?

Answer 11

no

Answer 12

Do you know how to add, subtract, multiply and divide?

Answer 13

yes

Answer 14

Well, you can do this. Start with dividing both sides by 2. What do you get afterwards?

Answer 15

You can do this:

\[\frac{12}{2} = \frac{2(x+8)}{2}\]

Answer 16

Which is the same as

\[\frac{12}{2} = \frac{2}{2}(x+8)\]