这条算式的答案是甚么?(a-4)^2+[3/4(a-4)]^2=100

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这条算式的答案是甚么?(a-4)^2+[3/4(a-4)]^2=100这条算式的答案是甚么?(a-4)^2+[3/4(a-4)]^2=100这条算式的答案是甚么?(a-4)^2+[3/4(a-4)]^

这条算式的答案是甚么?(a-4)^2+[3/4(a-4)]^2=100
这条算式的答案是甚么?
(a-4)^2+[3/4(a-4)]^2=100

这条算式的答案是甚么?(a-4)^2+[3/4(a-4)]^2=100
=>(1+9/16)*(a-4)^2=10^2
=>(5/4)*|a-4|=10
=>|a-4|=8
=>a=12或-4