Question 180941
 student opens math book two facing pages the product is 1980 what is the first page and the second page? 
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There are 2 ways to do this:
#1, the hard way.
n*(n+1) = 1980
{{{n^2 + n - 1980 = 0}}}
(n+45)*(n-44) = 0
n = 44
n = -45
Not many books have negative page #s, so it's 44 and 45.
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#2, the easy way.
Since the numbers differ by only 1, the square root of 1980 will be between the 2.
{{{sqrt(1980) = 44.497...}}}
It's 44 and 45.