book Maths Puzzle Numerical Ability

Hi, could you show me how to sovle this math problem:

[5 -2 -1] . [-4 2]
[8 0 3] [1 0]

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book Other Question

1.factor completely (5x^2+14x+13)^2-16((x^2+x-2)^2
2.factor out x^3+x^4y^4+y^6
3.a square has a perimeter of 12x+28cm.find its area.
4.a circle has a radius of 3x-5cm.find its a Can you please solve this for me? I have to solve this using factoring:

The sum of the squares of two consecutive negative even integers is 340. Find the integers.