book Maths Puzzle Numerical Ability

Can you please help me solve (w-9)^2
These kind of problems are a little complicated to me and I need your help in solving and showing my work.

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book Other Question

GRAPH {{{y^2+(x+1)^2-2x^2=100}}} two circles each of radius 5cms intersect each other. if the distance between their centres is 5 root 2 cms, find the area of the portion common to the two circles.