Question

if a+b+c=4 and ab+bc+ca=12 them find the value of a²+b²+c²

Answer 1

Answer:

Step-by-step explanation:

Given that,

a+ b + c = 4 and ab + bc + ca = 12

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

= ( 4 )² - 2 ( 12 )

= 16 - 24

= - 8 is the answer.