Quantitative Aptitude Algebra Identities

ఒకవేళ a2 + b2 + c2 = 6.25 మరియు (ab + bc + ca) = 0.52 అయితే, (a + b + c) విలువ ఎంత, (a + b + c) < 0 అయితే?

1
\(\pm\) 2.8
2
\(\pm\) 2.7
3
-2.7
4
-2.8

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