Question

If a+b = 8 and ab = 15. then a³+b³ is

• A. 224
• B. 244
• C. 152
• D. 128

Answer 1

Answer:

C. 152

a+b=8 and, ab = 15 (a+b)³ = a³ +b³ +3ab(a+b) a³+b³=(a+b)³ –3ab(a+b) = 8³-3x15x8 =512-360 =152