- #1
Amaz1ng
- 42
- 0
Homework Statement
Simplify:
[tex]3c-(\frac{2a+c}{8}-\frac{a+2c}{4})[/tex]
The Attempt at a Solution
I got this:
[tex]\frac{9c}{8}[/tex]
But the answer is:
[tex]\frac{27c}{8}[/tex]
It's simply an issue with whether I find the LCM or I use this formula:
[tex]\frac{a}{b}-\frac{e}{f}=\frac{a*f-b*e}{f*b}[/tex]
If I use that, I get my answer which is wrong but if I find the LCM which is 8...it's the correct answer. What logic am I missing to know which to use that formula and when to just find the LCM?
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