exam Maths Puzzle Numerical Ability

I'm having difficulty in setting up this problem. I'm not sure if I should use a generating function or binomial coefficients. I'm thinking it would be easier to solve with a gen

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14. 12a to the power of 3b to the power of 2, 18a to the power of 2 b to the power of 3, 6a to the power of4 b to the power of4

42. 4s + 6st - 14st2 If two sides of a triangle are equal, the angles opposite these sides are unequal and the greater angle lies opposite the greater side, and conversely