Question

If a +b+c is equal to 6 and a²+b²+c² is equal to 26 ,find the value of ab + bc + ca​

Answer 1

Answer:

Step-by-step explanation:

given:

a + b + c = 6 , a² + b² + c² = 26

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

by problem:

(6)2 = 26 + 2 (x)

12 = 26 + 2x

12 - (-26) = 2x

12 + 26 = 2x

38 = 2x

x = 38/2

x = 19

hope it helps u....