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If x2+y2+z2 = 40 and xy + yz + zx = 30, then x +y + z is equal to |
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Answer» Step-by-step explanation: (x+y+z)²=x²+y²+z²+2xy+2yz+2zx = 40. +2(xy+yz+zx) = 40. +2(30) = 40. + 60 =100 x+y+z. =ROOT 100 =10
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