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While solving an problem , i came to this quadratic
x2- 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!
x2- 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!