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Put y=(x+3) (x-7) into the form a(x-h)^2 +k.
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Put y=(x+3) (x-7) into the form a(x-h)^2 +k.

User Nolonar
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y=(x+3)(x-7)=x^2-7x+3x-21=x^2-4x-21=\\x^2-4x+4-4-21=\boxed{(x-2)^2-25}
User Tooshel
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