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ruralkansas
 
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Default Finding real values of a function

I am using Excel 97 and was told I can figure algebra problems with it. Any
ideas on how to solve an equation like:
f(x)=12-8x for x=-1; 0; and 1
or
y(x)=3(x-2)w/ exponent 1/2

Thanks! I can't find a function in the list that lets me use the variable x.