Răspuns :
x² - 25 = (x + 5)(x - 5)
4x² - 9 = (2x + 3)(2x - 3 )
y² - (36/49) = (y - 6/7) (y + 6/7)
4x² - 9 = (2x + 3)(2x - 3 )
y² - (36/49) = (y - 6/7) (y + 6/7)
Obs. Folosim formula (a+b)(a-b) = a² - b²
x² - 25 = (x + 5)·(x - 5)
4x² - 9 = (2x + 3)·(2x - 3 )
y² - (36/49) = (y + 6²/7²)·(y - 6²/7²) = (y + 6/7)(y -6/7 )
x² - 25 = (x + 5)·(x - 5)
4x² - 9 = (2x + 3)·(2x - 3 )
y² - (36/49) = (y + 6²/7²)·(y - 6²/7²) = (y + 6/7)(y -6/7 )