exam Maths Puzzle Numerical Ability

Please help me solve this equation:
c^2+2c-24=0

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exam Other Question

please solve the problem for me.
nC0.nCn + nC1.nCn-1 + nC2.nCn-2 + ...........+nCn.nC0=(2n!)/(n!)^2
Please help factor my homework question. thanks!

(2q+5)(3q-4)= 0