exam Maths Puzzle Numerical Ability

please answer this problem and explain how you got the answer
2-4(-5+x)-2x

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exam Other Question

List the terms of the following expression.
2b to the 2nd power + 7b + 10 Solve by completing the square:
x^2 - 16x + 63 = 0

I have four answers:
a) -7, 9
b) 7,9
C) 7, -9
D) -7, -9

When I plug in these answers, I do not come up with zero, am I doing something wrong? Thank you for your help!