Rationalize the numerator

Question

a. √a-2/(a-4)

b. (√(x+h)-x)/x

 

How do I get

a. 1/(√a-2)

b.1/(√(x+h)+√(x))

as the answer?

Answer 1

Part a)

 

Multiply the expression by (a+2)/(a+2)

 

Part b)

 

Multiply the expression by [(√(x+h)-√(x)]/[(√(x+h)-√(x)]