exam Maths Puzzle Numerical Ability

A= [2 -1] B= [4 -2]
[3 0] [5 1]

Find 3A-B.

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exam Other Question

Please help me solve this, I have posted it several times.

Determine if the ordered pair is a solution of the equation

3x-y=12 (0,4) (4,0) (-1, 15)

Please help me out on this

Thanks Find the polynomial f(x) of degree three that zeroes at 1, 2, and 4 such that f(0)=-16.

Thank you!