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What a value should be I need to form a perfect square trinomial x2-2x+

What a value should be I need to form a perfect square trinomial x2-2x+-example-1

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the perfect square trinomial equation is


(a+b)^2=a^2+2ab+b^2
x^2+12x+36
x^2+14x+49
x^2-4x+4
x^2-2x+1
x^2-20x+100