Find C such that polynomial function f(x)=4x^3 + Cx - 27 has a double root
Double roots help?
If f(x) has a double root this also root of the derivative
f´(x) =12x^2+C=0 so x=+-sqrt(-C/12) so C must be negative
so C=-27 and x= -sqrt(27/12) =-3/2
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