Question

Q21. If a³ + b3 = 125 and a - b = 5 then a² + ab + b² is:
Biss C
(a) 20
(b) 110
(c) 25
add
(d) 65​

Answer 1

Answer:

a³ + b^3=(a - b) {a² + ab + b² }

125=5* {a² + ab + b² }

{a² + ab + b² }=125/5=25