If a+b =6 and ab =4 then what is the value of a3 + b3.
Option A) 120 B) 125 C) 144 D) 81 Detailed solution We know that a+b=6 and ab=4. Using (a+b)2 = a2 + b2 + 2ab a2 + b2 = (a+b)2 -2ab a2 + b2 = 62 -2×4 a2 + b2 = 28 Using (a3 + b3) = (a+b) (a2 + b2 – ab) = ( … Read more