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2x²+7x+5=(2x+5)(x+1)
x²-16=x²-4²=(x+4)(x-4)
9y²-25=3y²-5²=(3y-5)(3y+5)
y²-14y+49=(y-7)(y-7)=(y-7)²
4y²-20y+25=(2y-5)(2y-5)=(2y-5)²