Question

if a+b = 12, ab = 27 then find the values of
(i) a²+b² (ii) a² - b² (iii) a³+b³​

Answer 1

Answer:

i) a²+b² = 3²+9²+2×3×9

= 9+81+54

= 90+54

= 144

ii) a²-b² = 3²+9²×3²-9²

= 90×-72

= 6480