- #1

1/2"

- 99

- 0

x

^{2}- 8x +4 =0

I couldn't break up 8x so i to solve it like this,

x= {-(-8)+√(8

^{2}+ 4x1x4)}/2x1,{-(-8)-√(8

^{2}+ 4x1x4)}/2x1

but the answers are coming way too absurd and negative.

The actual problem is:

**"A hollow right cylinder of uniform thickness is made from the material obtained by melting a solid sphere of copper.If the diameter of the sphere is 12 cm,the height of the cylinder is 72 cm and the external radius of the base of the cylinder is 4 cm then find the thickness of the cylinder to two decimal places. "**

And answer according to the book is 0.54 cm( which i am not getting !)

My doing any mistake in calculating or in the formulas?

Please help .I would be extremely grateful!