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How to solve these easy equations below? (quadratic equation)

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Übel
Übel 2014-11-9
编辑： Roger Stafford 2014-11-9
C=1*L-(2*L+3);
C=7/(4*5*L^6);
Both C and L are unknown variables. How could I solve these equations? Looking for your answer!

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回答（2 个）

Image Analyst
Image Analyst 2014-11-9
Sounds like homework - is it? I'd set them equal to each other (to eliminate C) then use fzero() to find L, then stick in either equation to find C. Give that a try and come back with MATLAB code if you want any help with it. By the way, I don't see how the quadratic equation applies to this 6th order equation.
Roger Stafford
Roger Stafford 2014-11-9
编辑：Roger Stafford 2014-11-9
Eliminate C and get the polynomial equation
20*L^7 + 60*L^6 + 7 = 0 (<-- Corrected)
and use 'roots'.

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