Question 58246
Which of the following polynomials can be factored as a difference of two squares? 
:
 16x2 + 1  sum not difference
 {{{9y^2-1}}}  -,2 terms, 3y*3y=9y^2 and 1=1*1  We have a winner!!!
 x2 + 4x + 4  3 terms not 2
 144a2 + 16  sum not difference
 all of the above  speaks for itself
:
difference means subtraction, -.
two means there are two terms.
squares means that something times itself can make the term.
:
Our winner can be factored this way:
{{{9y^2-1=(3y+1)(3y-1)}}}
Happy Calculating!!!