I think the answer is (13-t)(13+t) because when you expand the brackets some of it cancells out like +169 - 169. As they are the same (but ones got a plus and ones got a minus) they cancel each other out. :)
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t(t-1)
169 squared is 28,561. 28,561 squared is: 815,730,721
X squared + 7X + 12?
169
13 squared (13 x 13) = 169
-5
5
13 squared = 169
13X squared + 7X + 12
What about it? Factorise it?
It is: x(x-3) factorized
m(m - 1)