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# Very short binomial question, help appreciated! :D Watch

1. Hi

what does 'expand (1+6x)^2 for 5 non zero terms
What does that mean? :/
that isn't the real question, i've used it so as not to add my actual question, as it's not really that part of the question i need help with-if that makes sense.

Thanks
2. It means the first 5 terms (constant, x, x^2 etc) that do not equal zero. The more terms you have, the closer it is to the original form.
The example you gave, (1+6x)^2, expands to 1+12x+36x^2 so I'm a little confused. You would usually have a non-natural number as your exponent for the question to make sense.

The green is very hard to read... :P
3. What board you with?
4. (Original post by CallumCameron)
It means the first 5 terms (constant, x, x^2 etc) that do not equal zero. The more terms you have, the closer it is to the original form.
The example you gave, (1+6x)^2, expands to 1+12x+36x^2 so I'm a little confused. You would usually have a non-natural number as your exponent for the question to make sense.

The green is very hard to read... :P
so, if my expansion part i have: 1 + 3/2ax + 3/8a^2x^2...., is that what they mean by non zero terms? and if it's '5 non zero terms' then it's upto x^6, right?

Thanks alot
5. (Original post by dream123)
so, if my expansion part i have: 1 + 3/2ax + 3/8a^2x^2...., is that what they mean by non zero terms? and if it's '5 non zero terms' then it's upto x^6, right?

Thanks alot
Yes, that's what they mean. Although it should be up to x^4 as the constant is also included. If you do come across a term that does equal zero, just add an extra term on the end so you still have 5. Eg, if x^3 had a coefficient that was zero, x^5 would be the fifth non-zero term.

Hope that helps!
6. (Original post by CallumCameron)
Yes, that's what they mean. Although it should be up to x^4 as the constant is also included. If you do come across a term that does equal zero, just add an extra term on the end so you still have 5. Eg, if x^3 had a coefficient that was zero, x^5 would be the fifth non-zero term.

Hope that helps!
Ah righty!
Thank you very much, rep is on its way
7. (Original post by dream123)
Ah righty!
Thank you very much, rep is on its way

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