find the value of ab+bc+ac

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Ifa,b,c satisfy the equation a^2+ 6b= -14, b^2 +8c +23 = 0, c^2 +4 a - 8 =0 then find the value of ab+bc+ac ?
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If a + 0:01:26

If a + b – c = 5 and ab – bc – ac = 10, then find the value of a^2 + b^2 +c^2

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