x3 - 25 = 12, x + 5 = 4, x - 5 = ?
A 2
B 3
C 4
D 6
Solution
Correct Answer: 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
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