Question

if a square + b square + c square equals to 20 and a + b + c is equals to zero so a + b + BC + AC will be


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Answer 1

Explanation:

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

ab + bc + ac = --20 / 2 = -10 ans.