Question 39245
a.(sqrt2 + 5)(sqrt2 - 3)
Use FOIL to get:
2+2sqrt2-15
=2sqrt2 - 13
 
b. sqrt5/sqrt8 
Multiply numerator and denominator by sqrt2 to get:
sqrt(10)/4

c. (6 - sqrt20)/2 
Divide each term be "2" to get:
3 - sqrt(5)
Cheers,
Stan H.