Question 1018017
Too many questions.  Basic concepts are needed for all of them.


Number 3:
Learn how Difference of Squares is obtained.
{{{(2r-3)(2r+3)}}}
If using Distributive Property,
{{{2r*2r+2r*3+(2r)*(-3)+(-3)(3)}}}
{{{4r^2+6r-6r-9}}}
{{{4r^2+0-9}}}
{{{4r^2-9}}}--------------the linear term was 0, and this needs not to be written because it is the Additive Idcentity.