Question

Rationalize the denominator of 5 over quantity of 9 plus square root of 5

quantity of 45 minus 5 square root of 5 over 76
quantity of 45 minus square root of 5 over 76
5 square root of 5 over quantity 9 square root of 5 end root plus 5
5 square root of 5 over 86

Answer 1

5/ ( 9 + √5)
Rationalize :
5 ( 9 - √5) / ( 9 + √5) ( 9 -√5)
Can you continue?

Answer 2

I really have no idea, I listened in class and everything but this one unit is what has me stumped, I understand if you dont want to give me the answer straight out answer but i really dont know what to do.

Answer 3

( a + b) ( a - b) = a² - b²
( 9 + √5) ( 9 -√5) = ...?

Answer 4

how do i add to the square root of 5? or even minus it..

Answer 5

That's where you need to learn the formula to rationalize:
( a + b) ( a - b) = a² - b²
a = 9, b = √5
( 9 + √5) ( 9 -√5) = ...

Answer 6

9

Answer 7

imean sqrt 14 and sqrt of 4 ?

Answer 8

a = 9 --> a² = ...?
b = √5 --->b² = ..?

Answer 9

does a = 9^2
b = sqrt5^2
?

Answer 10

Yes, a² = 9² = ...?

Answer 11

81

Answer 12

b² = ...?

Answer 13

sqrt 25

Answer 14

b = √5 --->b² = ( √5 )² = 5

Answer 15

Now a² - b² = ...?

Answer 16

i dont know how to subtract that..

Answer 17

a² - b²
= 81 - ... =

Answer 18

wait so 5?? 81 x 5?

Answer 19

a² - b²
= 81 - 5
=

Answer 20

i mean minus... 76

Answer 21

This is denominator:
( a + b) ( a - b) = a² - b² a = 9, b = √5
( 9 + √5) ( 9 -√5) = 81- 5 = 76

Answer 22

Numerator:
5 ( 9 - √5) = ...?

Answer 23

32 1/2

Answer 24

Distribute 5 into the bracket:
5 ( 9 - √5) = 45 - 5√5

Answer 25

wouldnt that be like 33.something..

Answer 26

Now compare my solution with the choices!

Answer 27

wait the 5(9-sqrt5) one ?

Answer 28

= ( 45 - 5√5 ) / 76

Answer 29

answer a. thanks

Answer 30

NO, it's not!

Answer 31

what ?!

Answer 32

I mean a choice is correct!
About your asking if my solution as same as yours, so it's NOT!

Answer 33

ohhk.