4x²+1/4-9y²-2x=? (ab+1)²-(a+b)²=?

4x²+1/4-9y²-2x=? (ab+1)²-(a+b)²=?
4x²+1/4-9y²-2x=? (ab+1)²-(a+b)²=?

4x²+1/4-9y²-2x=? (ab+1)²-(a+b)²=?
4x²+1/4-9y²-2x
=4x²-2x+1/4-9y²
=(2x+1/2)²-9y²
=(2x+1/2+3y)(2x+1/2-3y)
(ab+1)²-(a+b)²
=(ab+1+a+b)(ab+1-a-b)