Translating to Equation

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I am suppose to translate into an equation and then solve this equation....


The square of a number minus twice the number is 48. Find the number. Let x=the number


The equation for this is x^2-2x=48
Then it becomes x^2-2x-48=0
What do I do after this?!? I got lost here....
 
Oh ok so the 2nd step that I posted isnt neccessary?!?(The step after x^2-2x=48)
 
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