Answered

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x equals 15 and z equals 7

[tex] {z}^{2} + 3 \: (x - z {)}^{2} [/tex]
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Sagot :

Pandahelloidn
I believe the answer is 241.
z^2+3(x-z)^2
7^2+3(15-7)^2
49+3(8)^2
49+3(64)
49+194
241
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