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(2k+3a) (2n+3a)
2. a^3+b^3=637
a+b=13
(a+b)^3=13^3
a^3+3a^2b+3ab^2+b^3=2197
a^2+b^3+3ab(a+b)=2197
637+3ab(13)=2197
637+39ab=2197
39ab=2197-637
ab=1560/39
ab=40
(a-b)^2
(a+b)-4ab
13^2-4(40)
169-160
9