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[tex]18 {c}^{3} - 50c = 0 [/tex]
[tex]2c(9 {c}^{2} - 25) = 0 [/tex]
[tex]2c(3c + 5)(3c - 5) = 0[/tex]
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[tex]2c = 0[/tex]
[tex]c = 0[/tex]
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[tex]3c + 5 = 0[/tex]
[tex]c = - \frac{5}{3} \\ [/tex]
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[tex]3c - 5 = 0[/tex]
[tex]c = \frac{5}{3} \\ [/tex]
Done...
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