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r = -5x^2 + 73x

Can someone show me the steps to complete the square for that equation? I don't really understand them.

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-5x^2 + 73x
-5(x^2 - 73/5 x)
-5(x^2 - 73/5 x + (73/10)^2) + 5(73/10)^2
-5(x - 73/10)^2 + 5329/20

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