Asked by bella

a=1/2 h(a+b)
solve for b
Answered by mathhelper
the b is stuck inside the bracket , so we have to fish it out

multiply each side by 2
2a = h(a+b)
distribute ...
2a = ah + bh
isolate the term containing b
2a - ah = bh
divide both sides by h
(2a - ah)/h = b