A) (y-1)²-16 = (y-1+4)(y-1-4) = (y+3)(y-5)
Б) (2a+3)²-4a² = (2a+3+2a)(2a+3-2a) = (4a+3)(3) = 3(4a+3)
В) (x+2y)²-9x² = (x+2y+3x)(x+2y-3x) = (4x+2y)(-2x+2y)
A) (y-1)²-16 = (y-1+4)(y-1-4) = (y+3)(y-5)
Б) (2a+3)²-4a² = (2a+3+2a)(2a+3-2a) = (4a+3)(3) = 3(4a+3)
В) (x+2y)²-9x² = (x+2y+3x)(x+2y-3x) = (4x+2y)(-2x+2y)