Question

If a³ - b³ = 899 & a-b=31, then (a - b)² +3 ab is equal to.​

Answer 1

Answer:

first of all

a³-b³= (a-b)(a²+ab+b²)

next is

899=31 (a²+ab+b²)

now

899-31= a²+b²-2ab+3ab

now

868=(a-b)²+3ab

so the answer is 868