My answer to this question seems close to that of the book but I have only solved for +1/2 and not the -1/2. Can anyone help?(adsbygoogle = window.adsbygoogle || []).push({});

Many thanks.

1. The problem statement, all variables and given/known data

Q.The area of a triangle is [itex]\frac{-4m^2 + 4m - 1}{m}[/itex]. Find the value of m via differentiation.

2. Relevant equations

3. The attempt at a solution

Attempt:[itex]\frac{dA}{dm}[/itex] = [itex]\frac{4m^2 - 4m - 1}{m^2}[/itex] = 0 => 4m^{2}- 4m + 1 = 0 => (2m - 1)(2m - 1) => m = 1/2

Ans.: (From text book): [itex]\frac{dA}{dm}[/itex] = [itex]\frac{-4m^2 + 1}{m^2}[/itex] = 0 => m = +/- 1/2

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Finding Derivitive of a Triangle Area

**Physics Forums | Science Articles, Homework Help, Discussion**