Question

X equals 15 and z equals 7 0%7B%29%7D%5E%7B2%7D%20" id="TexFormula1" title=" {z}^{2} + 3 \: (x - z {)}^{2} " alt=" {z}^{2} + 3 \: (x - z {)}^{2} " align="absmiddle" class="latex-formula">
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Answer 1

I believe the answer is 241.

Answer 2

Z^2+3(x-z)^2
7^2+3(15-7)^2
49+3(8)^2
49+3(64)
49+194
241