# Math Help - Help!! find the minimum

1. ## Help!! find the minimum

a, b, c, d R
find the minimum of a2+b2+c2+ac+bd

help me!! thanks

2. ## Re: Help!! find the minimum

Hey li00512.

Have you been taught multivariable calculus and Lagrange multipliers? There may be a simpler solution, but this a systematic approach for optimization problems.

3. ## Re: Help!! find the minimum

hi, chiro.
I want to find a simpler way to solve this problem.
and I just realized that I mistyped the problem.
sorry, it should be "find the minimum of a2+b2+c2+d2+ac+bd".