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If a +b+c=9 and ab+bc+ca=19Find a^2+b^2+c+2. |
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Answer» Answer: Step-by-step EXPLANATION: (a+b+c)^2 =a^2+ b^2+ c^2+2ab+2bc+2ca 81=a^2+b^2+c^2+2*19 a^2+b^2+c^2=81-38 = 43 |
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