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To the squares!

Number Theory Level 2

Let $x$ , $y$ and $z$ be all positive integers with $xy=21$ , $xz = 28$ and $yz=12$ . Find $x^2 + y^2 + z^2$ .

28 62 39 50 74

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Excel in math and science

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by Jessey Uche-Nwichi

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