Work Step by Step
When taking the square root of a number, you get a positive and a negative answer. $3(x-7)^2+8=647.48$ $3(x-7)^2=639.48$ $(x-7)^2=213.16$ $x-7=14.6$ $x=21.6$ or $x-7=-14.6$ $x=-7.6$. So $x=-7.6,21.6$.
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