exam Maths Puzzle Numerical Ability

operation on polynomials:(36x3-15x2a3-4a2+8)-(2a3+6a-3)

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exam Other Question

Solve by completing the square:

w(6w+5)=4
Given that A=[4 5 -6
-9 0 3
8 2 -1] and B=[1 7
8 -14
5 -9] what is a13 + b12