Question

I am just not good at subtracting radicals....
sqrt{5}-sqrt[3]{20}-sqrt[3]{5}-sqrt[2]{20}

Answer 1

\[\sqrt{5}-\sqrt[3]{20}-\sqrt[3]{5}-\sqrt[2]{20} \]

Answer 2

Thanks again Kboy!

Answer 3

\[\sqrt{20}=2\sqrt{5}\]...are u sure its \[\sqrt[3]{20}\]?

Answer 4

yes

Answer 5

you can rewrite as (sqrt(5) - 2sqrt(5)) to get -sqrt(5), but i cant see much that u cn do with the other two terms.

Answer 6

Yes and I checked and that is exactly how the question is written

Answer 7

ugh lol!

Answer 8

ok.lets do this:\[\sqrt[3]{20}=\sqrt[3]{5*4}=\sqrt[3]{5}*\sqrt[3]{4}\]

Answer 9

now take out \[\sqrt[3]{5}\] as a like term

Answer 10

so the answer is \[-\sqrt{5} -\sqrt[3]{5}(1 + \sqrt[3]{4})\]

Answer 11

ok...
so do you eliminate \[\sqrt[3]{5}\] from the equation

Answer 12

not eliminate...extract as a common term

Answer 13

ok so I am trying to decifer this can you please go step by step with me sorry for asking this of you

Answer 14

ok first rearrange the initial equation by grouping "like terms".we have square roots and cube roots. so we rewrite initial equation as:\[(\sqrt{5}-\sqrt{20})-(\sqrt[3]{20}+\sqrt[3]{5})\]

Answer 15

ok but you are suppose to subtract everything?

Answer 16

yes,we are still. now we rewrite \[\sqrt{20} \] as \[2\sqrt{5}\] and \[\sqrt[3]{20} \] as \[\sqrt[3]{4}*\sqrt[3]{5}\]

Answer 17

ok but you are suppose to subtract everything?

Answer 18

why did you add \[\sqrt[3]{5}\] then?

Answer 19

we then get:\[(\sqrt{5}-2\sqrt{5}) - (\sqrt[3]{5} + \sqrt[3]{5}*\sqrt[3]{4})\]

Answer 20

the negative sign outside the bracket will make it negative if you multiply out, so we are still subtracting it

Answer 21

ok but you are suppose to subtract everything?

Answer 22

ohhhhh ok

Answer 23

now we simplify and get:\[(-\sqrt{5})-(\sqrt[3]{5}+\sqrt[3]{5}*\sqrt[3]{4})\]

Answer 24

now do you see that you can take out \[\sqrt[3]{5}\] as a common factor in the second bracket

Answer 25

but you are adding it not dividing?

Answer 26

we are subtracting, the negative sighn outside the bracket will make it negative agen

Answer 27

ohhh ok i see

Answer 28

the answer is :\[-\sqrt{5}-\sqrt[3]{5}(1 + \sqrt[3]{4})\]

Answer 29

ok you lost me I thought it would\[\sqrt{5}*\sqrt[3]{4}\]

Answer 30

and couldn't you simplify simplify the square rooted 5's

Answer 31

lol. mayb capslock will help...WE ARE SUBTRACTING. take the answer i gave you, it is right.and no u cant simplify the sqrt(5). if u dnt undertand im sure the lecturer shud b able to clarify things further for u.

Answer 32

ok ok im sorry thank you for everything

Answer 33

no worries.sorry i cudnt make you fully understand

Answer 34

it's alright it's my fault

Answer 35

just practice them more,there isnt much to it,im sure ul master them soon.goodluck. :)

Answer 36

haha thanks again