Question 1168683
A few changes to make description more readable:

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Kerwin's father is 4 years more than five times as old as him*. The product of their ages in years is 204.  How old is Kerwin?
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* ("him" who?  I assume you meant, "Kerwin".)


k, Kerwin
f, his father


{{{system(f=4+5k,kf=204)}}}



The substitution and algebra steps should bring to {{{5k^2+4k-204=0}}};

Discriminant is ,..... {{{64^2}}}


{{{k=(-4+64)/(2*5)}}}

{{{highlight(k=6)}}}-------Kerwin's age now

From that, Father's age is {{{highlight(34)}}}.