# Find 2f(a) in the function f(x)

• Jun 24th 2010, 01:39 AM
superduper1
Find 2f(a) in the function f(x)
If f(x) = 2x^2-x +4
Find 2f(a)

How do I deal with the 2 in front of the f(a) ?
Typically I just plug 'a' into the values of x and compute. But how do I deal with the 2?
• Jun 24th 2010, 01:42 AM
mr fantastic
Quote:

Originally Posted by superduper1
If f(x) = 2x^2-x +4
Find 2f(a)

How do I deal with the 2 in front of the f(a) ?
Typically I just plug 'a' into the values of x and compute. But how do I deal with the 2?

$2 f(a) = 2(2a^2-a +4) = ....$
• Jun 24th 2010, 01:47 AM
superduper1
2f(a) = 4a^2 - 2a + 8 ?
• Jun 24th 2010, 05:41 AM
Quote:

Originally Posted by superduper1
2f(a) = 4a^2 - 2a + 8 ?

yes, just multiply f(a) by 2.