5(x-12)^2 = 405

This is about a box problem. I got to the equation but solve the equation.
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1 Answer

5(x-12)^2 = 405

both side divided by 5

 

(x-12)^2 = 81

both side √

x-12 = ±9

so

x= ±9+12

so

x= 3 or x=21

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