## anonymous 5 years ago rationalize denominator : please help 1.) 4/ sqrt. 7p 2.) srqt.98/x 3.) 9/3 sqrt.y 4.) sqrt.7 / sqrt.5 +7

1. anonymous

1.) 4/7p−−√ 2.) 98−−√/x 3.) 9/3y√ 4.) 7√/5√+7

2. anonymous

$1.) 4/\sqrt{7p}$

3. anonymous

2.) $\sqrt{98}/x$

4. anonymous

The denominator is not supposed to have a square root. So when you rationalize you get rid of the square root in the denominator by multiplying the numerator and denominator by the square root, which is essentially multiplying by 1 so it doesnt change the value of the expression.

5. anonymous

3.) $9/^{3}\sqrt{y}$

6. anonymous

4.) $\sqrt{7} / \sqrt{5} + 7$

7. dumbcow

haha thats why its a cubed root, not 9/3

8. anonymous

yes i sent you the correction in the other post

9. anonymous

xavier : so i take out the sqrt ?

10. anonymous

LIke for 4/sqrt(7p). Multiply the numerator and denominator by sqrt(7p). So the denominator gets "rationalized" because sqrt(7p)*sqrt(7p) is simply 7p.

11. anonymous

so the answer would be : 4 sqr.7p ? or 4sqrt.7p/7p ?

12. anonymous

or ?

13. anonymous

4sqrt(7p)/7p

14. anonymous

and fot the second one ? would it be 7sqrt.2x ? or 7sqrt. 2/x ?

15. anonymous

$7 \sqrt{2x} , 7 \sqrt{2/x}$