book Maths Puzzle Numerical Ability

How would you factor x^2 + 10x + 8. It is part of a larger problem I am having alot of trouble with

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Hi, I really need some help!

Write a quadratic equation with -7 and 5 as its roots.

Thank You!!! Please help me solve this problem (2x2 matrix)
If A=[1 -2, 1 0] and AB=[1 0, -1 2]Find B.

I tried multiplying A*AB changing the signs of AB but the answer did not come out right.
Answer should be B=[-1 0, -1 1]