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How do u do this? HELPPPPPPPPPPPPPPPPP

How do u do this? HELPPPPPPPPPPPPPPPPP-example-1
User Imran Azad
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Im not this sure but is D because 16-x^2 is 16-4x^2 and for x^2-9 needs a positive side to make x since there's no number behind the x symbol the hidden number is 1.
User DM Graves
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