Maths!!! Help prithee

Sorry for the bombardment
2root8 can also be written as 2^n
Calculate The value of n

Please explain to me how you got the answer

Reply 1

Kevin De Bruyne

Original post by Real_jenn

Sorry for the bombardment
2root8 can also be written as 2^n
Calculate The value of n

Please explain to me how you got the answer

2root8 = 2^n.

Does writing it like that help? :smile:

What could you do to the left hand side?

Reply 2

Star-girl

Original post by Real_jenn

Sorry for the bombardment
2root8 can also be written as 2^n
Calculate The value of n

Please explain to me how you got the answer

You want to express the surd entirely in terms of 2, then use the laws of indices to figure out what n is.

First try simplifying

2\sqrt{8}

- you can simplify the square root further.

Reply 3

Student232

2= 2 to the power of 1
Root 8= 2 to the 3/2
1+3/2=5/2
So it is 2 to the power of 5/2
Sorry I was wrong first time this is edited I think it's now right

Posted from TSR Mobile

(edited 8 years ago)

Reply 4

Real_jenn

Original post by Student232

2= 2 to the power of 1
Root 8= 2 to the 3/2
1+3/2=5/2
So it is 2 to the power of 5/2
Sorry I was wrong first time this is edited I think it's now right

Posted from TSR Mobile

That was exactly what I go!!! But aparantley the answer is 2.5 so I got really confused 😩😩

Reply 5

an_atheist

Original post by Real_jenn

That was exactly what I go!!! But aparantley the answer is 2.5 so I got really confused 😩😩

5/2 is the same thing as 2.5. How is this not immediately obvious, since all you need to do is convert 2.5 to a fraction.

Reply 6

Real_jenn

Original post by an_atheist

5/2 is the same thing as 2.5. How is this not immediately obvious, since all you need to do is convert 2.5 to a fraction.

Oh yeah I can't believe myself!! 2.5--> 250/100,25/10,5/2 lol why am I in set 1 maths !? Loool silly me and my miniature mistakes 😂😂,although thank you!