Quantitative comparison

Question 1

comparing two big quantities, always try to being them at the same level - 2A +1/2B

Answer 1

Use A+ and A-; B+ and B-

Question 2

When making quantities same - never divide or multiple by

Answer 2

1. negative number. Or check trial and error method with negative numbers
2. variable itself - unless variable>0 is given in the question

Question 3

Trial and error best numbers

Answer 3

0,1,-1,1/2,-1/2,10,-10

Question 4

two methods if one or more quantities is a quadratic equation

Answer 4

1. best numbers
2. reduce quadratic equation to an equation that is factorable ( +/- both sides)