2 câu trả lời
`Answer:`
`11+5.(x-1)^2=56`
`=>5.(x-1)^2=56-11`
`=>5.(x-1)^2=45`
`=>(x-1)^2=45:5`
`=>(x-1)^2=9`
`=>`\(\left[ \begin{array}{l}x-1=-3\\x-1=3\end{array} \right.\)
`=>`\(\left[ \begin{array}{l}x=-2\\x=4\end{array} \right.\)
Vậy \(\left[ \begin{array}{l}x=-2\\x=4\end{array} \right.\)
`#Boy`
`11+5.(x-1)^2=56`
`->5.(x-1)^2=56-11`
`->5.(x-1)^2=45`
`->(x-1)^2=45:5`
`->(x-1)^2=9`
`->(x-1)^2=3^2`
`->x-1=+-3`
`->[(x-1=3),(x-1=-3):}`
`->[(x=3+1),(x=(-3)+1):}`
`->[(x=4),(x=-2):}`
Vậy `x=4;x=-2`
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