Thread: Making r the subject

Hey guys,

As Im a noob at maths I need your help in making r the subject so I can figure out the radius of my nanoparticles. Can someone please help

Hi Donut

Mulitply both sides through by

you can then use the quadratic formula to solve for r.

hmm thats what I thought I should do but I get keep getting this obscenely small number. Back to the drawing board I guess >_<

Thanks for the reply

I might post up all my previous working in a sec and see if someone can see the holes in it.

Are the calculations right?

If I can find out that all the above maths is correct it would be a massive help

Take your solutions for r and sub them into the RHS of the equation. Does it give you the LHS?