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# How to expand this quadratic watch

1. (root(x) + 8root(x))^2

ie root(x) + 8(rootx) and the entire thing taken to power of 2
2. (Original post by jon2016)
(root(x) + 8root(x))^2

So here .

Now . Can you take it from here?
3. (Original post by Zacken)

So here .

Now . Can you take it from here?
Thanks
What is the (a +b)^2 = a^2 + 2ab + b^2 rule called ? looks similar to difference of two squares , when would know to use it ?

I was trying to do

(a+b)(a+b) and just got a huge mess
4. (Original post by jon2016)
Thanks
What is the (a +b)^2 = a^2 + 2ab + b^2 rule called ? looks similar to difference of two squares , when would know to use it ?

I was trying to do

(a+b)(a+b) and just got a huge mess
It comes from .

You would use this whenever you had (something + something else)^2.
5. How is this 'Undergraduate'? LOL

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Updated: April 16, 2016
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