A simple way to do this problem would be to factor x^2-x-12 into (x+3)(x-4)
we can then write:
(x+3)(x-4)/(x-4) and then the (x-4) in the top and bottom of the fraction both cancel leaving just x+3 as the solution.
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Divide coefficients and subtract exponents of the same variable. EX: (20 x6) / (4 x2) = 5 x4
1817 litres
sqrt(x4) = x4/2 = x2
N = x4 x8 = x4+4 = (x4)2 = N2