book Maths Puzzle Numerical Ability

PLEASE HELP ME TO SOLVE THIS PROBLEM IF YOU CAN EXPLAIN TO ME?
{X|X<-3}
I HAVE TO WRITE EACH SET IN INTERVAL ROTATION, AND GRAPH IT ON THE LINE.

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book Other Question

write answers in descending powers of x ADD
1.(xsquared+3x)+(4xsquared-2)
I am supposed to solve this problem by completing the square:
(x squared) + 11x + 10=0