When \( x=2, y=3, z=4 \), find the value of the sum of \( 5 x^{2},-3 x y, z^{2} \). Also find th...

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When \( x=2, y=3, z=4 \), find the value of the sum of \( 5 x^{2},-3 x y, z^{2} \). Also find the value of \( 3 z^{x}+3 x y \).
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