Homework Help: Math

Posted by Jamie on Monday, November 8, 2010 at 12:55pm.

f(x)= 4-x^2 and g(x)= sqrt (x)

find the implied domain of fg(x)
fg(x)= f(sqrt(x))
fg(x)= 4-(sqrt(x))^2
fg(x)=4-(sqrt x)(sqrt x)
fg(x)=4-x
domain= (x:x=all real numbers)
Am I correct?

Math - anonymous, Monday, November 8, 2010 at 2:26pm
Are you trying to find f of g of x or f*g of x?
Math - Jamie, Monday, November 8, 2010 at 4:50pm
f of g of x

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