Question 936669

let two numbers be {{{x}}} and {{{y}}}

then the product of two numbers is {{{x*y}}} 

and, if one number (let say {{{x}}}) is {{{one}}} less than {{{twice}}} the other number, then {{{x=2y-1}}}

now substitute it in {{{x*y}}} and you have {{{(2y-1)*y=2y^2-y}}}