x3 - 25 = 12, x + 5 = 4, x - 5 = ?
সমাধান
সঠিক উত্তর: Option B
দেয়া আছে, x2 - 25 = 12
=> x2 - 52 = 12
=> ( x + 5 ) ( x - 5 ) = 12
=> 4( x - 5 ) = 12
∴ ( x - 5 ) = 12/4 = 3
=> x2 - 52 = 12
=> ( x + 5 ) ( x - 5 ) = 12
=> 4( x - 5 ) = 12
∴ ( x - 5 ) = 12/4 = 3
