g(x)=8/sqrt(x^2+4), x=sqrt(21)

Question

sqrt= square root. Please help me with this, I have no idea how to do this!

Answer 1

g(x) = 8/[√(x² + 4)]

 

x = √(21)

 

Since g(x) has the term x², we need to rewrite the given value of x.

 

x = √(21)

x² = 21

 

Now we can substitute this value into g(x).

 

g(x) = 8/[√(21 + 4)]

g(x) = 8/√(25)

g(x) = 8/5