Question

Evaluate f(x) = 3x, if x= 2a + b
​

Answer 1

f(x) = 6a + 3b

Explanation:

Hi ! Our task is to evaluate the function:

`\stackrel{\star}{\bullet}\qquad\sf{f(x)=3x}\phantom{12345678} x = 2a + b}`

We go ahead and plug in 2a + b for x:

`\stackrel{\star}{\bullet}\qquad\sf{f(x)=3(2a+b)}`

Now, we can also distribute 3:

`\stackrel{\star}{\bullet}\qquad\sf{f(x)=6a+3b}`

Answer 2

Evaluate f(x) = 3x for x = 2a + b

Substituting x into f.

f(2a + b) = 3(2a + b)

f(2a + b) = 6a + 3b

Hope this helps,

Jeron

:)