Choosen As Best Answer

(a^2)b - a(b^2) - a + b + 75 = 0
ab(a - b) - (a - b) + 75 = 0
6(a - b) - (a - b) + 75 = 0
5(a - b) + 75 = 0
5(a - b) = -75
a - b = -15

a^2 + b^2 = (a - b)^2 + 2ab
= 225 + 12
= 237

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