If a2 + b2 + c2-20 and a + b + cWe have0, find ab + bc + ca. – InterviewSolution

InterviewSolution

1.

If a2 + b2 + c2-20 and a + b + cWe have0, find ab + bc + ca.

Answer»

We know,(a+b+c)² = a²+b²+c² + 2(ab+ac+bc)

0² = 20 + 2(ab+ac+bc)

-20/2 = (ab+ac+bc)

(ab+ac+bc) = -10

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