A power2+b power2+c power2 =200 and ab+bc+ca=28 find a+b+c
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Step-by-step explanation:
(a+b+c)² = a²+b²+c² + 2(ab+bc+ca)
(a+b+c)² = 200 + 2(28)
(a+b+c)² = 200+56 = 256
a + b + c = √256 = 16
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