Question

A = bh/2

A' = b'h/2 + bh'/2

b' = (A' - bh'/2)(2/h) can someone explain this. its steps to the derivative of bh/2.

Answer 1

You need an explanation of the entire thing, or the last simplification?

Answer 2

uh, whole thing, why is product rule used for the second step and not quotient rule since its divided by 2, and i need help simplying step 2 to 3

Answer 3

Well the only variables are b and h on the right hand side, so the 2 is just a coefficient.... You can just rewrite it as :

(1/2)(bh) and do product rule for bh

Answer 4

got it.

Answer 5

so by what i said (1/2) (bh' + b'h)

Answer 6

and then you just isolate b'

Answer 7

right