Question

If a-b=3 and ab=28, then a3-b3 is ?​

Answer 1

Step-by-step explanation:

a²+b²=(a-b)²+2ab

=(3)²+2(28)

=9+56

=65

a³-b³=(a-b)(a²+b²+ab)

=3(65+28)

=3×93

=279

thanks for the question!!

Answer 2

Answer:

a²+b²

= (a-b)²+2ab

= 3²+2×28

=9+56

=65

=a³ – b³

=(a – b)(a² + ab + b²)

=(a-b) ( a²+b²+ab)

=3×(65+28)

=3×93

=279