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=25-20x+4x^2
= ordenas y te queda
4x^2-20x+25
es un producto notable y te queda (2x-5)(2x-5)
(10+2y)^2= 100+40y+4y^2
ordenas 4y^2+40y+100
es un producto notable y te queda (2y+10)(2y+10)
espero te sirva