已知y=根号下4-x+根号下x-4+2,求x的y次方+x的根号y次方

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4-x≥0,x-4≥0
x=4y=2======以下答案可供参考======
供参考答案1:
y=根号下(4-x)+根号下(x-4)+2 4-x≥0 x-4≥0 得x=4 y=2
x的y次方+x的根号y次方
=4^2+4^√2
=16+7.1029933013160154008607800151636
=23.102993301316015400860780015164