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I did not quite understand the solution. How to understand at one go that 9+x^2-6x is a equation for (3-x)^2
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officiisestyad
I did not quite understand the solution. How to understand at one go that 9+x^2-6x is a equation for (3-x)^2
Show more
a^2 - 2ab + b^2 = (a - b)^2.

This is the basic algebraic identity you must recognize at a glance for the GMAT. Without knowing those, you should not start practicing questions, especially harder ones.
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