exam Maths Puzzle Numerical Ability

Hi I need help with this

indicate which quadrant or coordinate axis contains the point.
(a)(3,-5)
(b)(-2,7)
(c)(0,-3)
(d)(-1,-2)
(e)(3,0)
(f)(6,4)

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exam Other Question

Factor the following trinomial:

16x^2 + 40xy + 25y^2

I am still a little confused by this stuff. I hope that someone can help me understand????
i AM HAVING PROBLEMS WITH THIS
Simplify
sqaure root7(9sqaure root2-3sqaure root7)

Thank you