Factoring Perfect Square Trinomials

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How would you factor perfect square trinomials? I have a perfect square trinomial 4x^2 - 20x + 25 = 0, and the answer given to me on the answer key is (2x - 5)^2. How do I get to this answer?

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Notice $$X^2\pm 2XY+Y^2=(X\pm Y)^2.$$

Yours is the $(X,Y)=(2x,5)$ case.