exam Maths Puzzle Numerical Ability

HELP!!! Please...Factor this polynomial and please show work so i can understand better how you got that
6x^2 + 13x - 5

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I have to factor this problem and I have not found a solution for it.
8ksquared-19k+9 Hi,

My brother is 13, and just want to query this question.

9y - 3y = 6y.

Is this correct? or does it subtract the y aswell meaning the answer would be:

9y - 3y = 6.

Thanks!!