Question

Descompunerea in factori ireductibili a sumei x la a 3- 6x la a 2+ 9x este ____________


Dau coroana

Answer 1

Dam factor x => x(x²-6x+9) = x(x-3)² Paranteza am restrans-o cu formula (a²-2ab+b²) = (a-b)².

Answer 2

x³  - 6 x² + 9 x = x ( x² - 6 x + 9 ) = x ( x - 3 )²

sau

= x ( x² - 6 x + 9 ) = x ( x² - 3 x - 3 x + 9 ) = x [ x ( x - 3 ) - 3 ( x - 3 ) ] = x ( x - 3 ) ( x - 3) = x ( x - 3)²