Question

if a²+b²+c²=280 and ab+bc+ ca =9/2, the find the value of (a+b+c )³​

Answer 1

Answer:

Step-by-step explanation:

now (a+b+c)³ = a²+b²+c² + 2ab + 2bc + 2ca

                      = 280 + 2 (ab + bc + ca)

                      = 280 +  2 x 9/2

                      = 280 + 9

                       = 289

Answer 2

0000000000000000000000000000000000028.5