# Thread: transposing formula

1. ## transposing formula

anyone transpose a in this formula to make it the subject?

A = h x (a + b)/2

2. Originally Posted by spanki007
anyone transpose a in this formula to make it the subject?

A = h x (a + b)/2
I assume the "x" is a multiplication symbol? If so, please don't use it. It looks too much like the variable x.

$\displaystyle A = h \cdot \frac{a + b}{2}$

$\displaystyle 2A = h(a + b)$

$\displaystyle 2A = ha + hb$

$\displaystyle ha = 2A - hb$

$\displaystyle a = \frac{2A - hb}{h}$

Then if you like
$\displaystyle a = \frac{2A}{h} - b$

-Dan

3. Thanks Dan

4. Originally Posted by topsquark
I assume the "x" is a multiplication symbol? If so, please don't use it. It looks too much like the variable x.

$\displaystyle A = h \cdot \frac{a + b}{2}$

$\displaystyle 2A = h(a + b)$

$\displaystyle 2A = ha + hb$

$\displaystyle ha = 2A - hb$

$\displaystyle a = \frac{2A - hb}{h}$

Then if you like
$\displaystyle a = \frac{2A}{h} - b$

-Dan
Your skill is awesome but us mortals recognize the X as multiplication and . as fraction :P. Seriously though i sometimes use brackets for multiplication as it's less ambiguous. e.g A = (h)(a + b)

-
Frank

5. ## Equation of perpendicular bisector

Edit: Oops, wrong topic.