If A + B = - 5 and AB = 6, then find the value of A3 + B3
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. -35.
A3 + B3 = (A + B)3 - 3AB(A + B)
= (-5)3 - 3(6)(-5)
= -125 - (-90)
= -125 + 90
= -35
Therefore, the required value is - 35.