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rationalise !!

Femii · 2011-01-10 17:01:54

rationalise the following (5wz-12x)/ √x +√y how can i solve it ? i dont know what they mean by rationalise!

10-01-2011 5:01pm

#1

Femii

Registered Users, Registered Users 2 Posts: 21 ✭

Join Date: December 2010

Posts: 8

rationalise the following

(5wz-12x)/ √x +√y

how can i solve it ?
i dont know what they mean by rationalise!

0

Comments

#2 10-01-2011 5:51pm

Fremen

Registered Users, Registered Users 2 Posts: 2,481 ✭✭✭

Join Date: May 2006

Posts: 2356

Are you sure they don't say "rationalise the denominator"? This means you convert the expression to an equivalent one that doesn't have square root symbols in the denominator.

Hint: what's (√x +√y)(√x - √y)?

0
#3 10-01-2011 7:20pm

Femii

Registered Users, Registered Users 2 Posts: 21 ✭

Join Date: December 2010

Posts: 8

no thats exactly what they asked,
this is anothr question:

(√(x-9) )-5x/x^4 -7

0