# Simplify #1

• Sep 21st 2011, 04:25 PM
habibixox
Simplify #1
Simplify the expression

so far i have

4a - 4a +h / a(a+h) / h

what's next?
• Sep 21st 2011, 04:37 PM
Wilmer
Quote:

Originally Posted by habibixox
4a - 4a +h / a(a+h) / h

Be careful, plus use proper bracketing; that should be:
[4a - 4(a+h)] / [a(a+h)] / h ; then:
(4a - 4a - 4h) / [ah(a+h)]
Continue...
• Sep 21st 2011, 04:48 PM
habibixox
distribute the 4 in the numerator an ah in the denominator...
you get

4a - 4a - 4h / [a^2h + ah^2) ]

then i cancelled all the a's and cancelled 4 -4
and got -4h / ah + h^2

now on the computer i entered -4 for the numerator and it came out to be correct....
but my denominator is wrong, why? what did i do wrong?
• Sep 21st 2011, 05:20 PM
Wilmer
Quote:

Originally Posted by habibixox
> 4a - 4a - 4h / [a^2h + ah^2) ]

Told you to be careful with bracketing; that should be:
(4a - 4a - 4h) / (a^2h + ah^2)
That's VERY important.

> then i cancelled all the a's and cancelled 4 -4
> and got -4h / ah + h^2

That should be: - 4h / [a^2h + ah^2]
= -4h / [h(a^2 + ah)]
= -4 / (a^2 + ah)
= -4 / [a(a + h)]