Question 1125951
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f(x)=x^2-1 and g(x)=3x+3, find (g-f)(8),  
(g-f)(8)= 
or 
(g-f)(8) does not exist??
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{{{g(8)-f(8)=3*8+3-(8^2-1)}}}
{{{24+3-63}}}
{{{27-63}}}
{{{highlight_green(-36)}}}