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We have f(x) = 5x - 2 and g(x) = x^(1/3) [ I have assumed by cubed sqrt you mean raised to the power (1/3)]

We have to find fog( - 8)

fog(x) = f(g(x)) = f( x^(1/3))

=5 * x^(1/3) - 2

For x = -8

fog(-8) = 5*(-8)^(1/3) - 2

=> 5* (-2) - 2

=> -10 - 2

=> -12

**The required result is -12**