Question

if a³+b³ = 370 qnd a²+b²= 58, find value of 2(a+b)​

Answer 1

Step-by-step explanation:

Given a+b =10

so (a+b)² =a²+b²+2ab

10² =58+2ab

∴2ab=100−58=42

∴ab=21

(a+b)³ =a³+b+3ab(a+b)

10³ =a³+b³+3×21×10

∴a³+b³

=1000−630=370

same process you should use on your problem (Q)