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2) y² - 1/16 = ( y + 1/4)(y- 1/4)
3) r² - 0,36= (r + 0,6)(r- 0,6)
4) r² -10 = (r + √10)(r - √10)
5) 36 p ² - 81 q³ = (6p + 9q)(6p - 9q)
6) 12 x² - 27 y²2 = 3( 4x² - 9y²) = 3(2x+3)(2x-3)
7) (a+b)² - c² = { (a+b +c) (a+b - c)}
8) 9(x+2y)² - 25 = {3(x+2y) +5) (3(x+2y) - 5)}
= {(3x+6y) + 5)((3x+6y) - 5}
= (3x+6y +5)(3x+6y - 5)