If $ a^2 + b^2 + c^2 = 6.25 $ and (ab + bc + ca) = 0.52, what is the value of (a + b + c), if ( a +b + c ) < 0 ?
Answer & explanation
Correct answer: option 2
If $ a^2 + b^2 + c^2 = 6.25 $
(ab + bc + ca) = 0.52
what is the value of (a + b + c)
(a + b + c)2 = $ a^2 + b^2 + c^2$ + 2(ab + bc + ca)
(a + b + c)2 = 6.25 + 2(0.52)
(a + b + c)2 = 6.25 + 1.04
(a + b + c)2 = 7.29
(a + b + c) = -2.7