289 - (2x - 3)² = 17² - (2x - 3)² = ( 17 - 2x + 3)(17 + 2x - 3) =
= (20 - 2x)(14 + 2x) = 2 * 2 * (10 - x)(7 + x) = 4(10 - x)(7 + x)
4(10-х)•(7+х)
Воть
289 - (2x - 3)² = 17² - (2x - 3)² = ( 17 - 2x + 3)(17 + 2x - 3) =
= (20 - 2x)(14 + 2x) = 2 * 2 * (10 - x)(7 + x) = 4(10 - x)(7 + x)
4(10-х)•(7+х)
Воть