Hi,
I think you should start by doing
4n(n+5)<1000, then rearrange it so you are left with the quadratic 4n^2+20n-1000<0 and then solve it.
I think the answer is 13 (as the thirteenth term is the final term which is below 1000 according to the quadratic, meaning there are 13 terms less than 1000.
Hope that helped
I think you should start by doing
4n(n+5)<1000, then rearrange it so you are left with the quadratic 4n^2+20n-1000<0 and then solve it.
I think the answer is 13 (as the thirteenth term is the final term which is below 1000 according to the quadratic, meaning there are 13 terms less than 1000.
Hope that helped
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