book Maths Puzzle Numerical Ability

-2+b_6=-14.What does the b stand for?

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book Other Question

I HAVE TO FACTOR THE POLYNOMIAL COMPLETELY. BUT I AM STUCK.

128xcubed yto the sixth - 50xto the sixth ycubed
it should look like this
128y3x6-50x6y3
WHAT DO I DO??PLEASE HELP ME. THANKS! I have to factor this polynomial, I know it has to be grouped, but I cant reach the solution provided by the text.

x^2+2xy+2x+y^2+2y-8