c^2 - 1 = (c - 1)(c + 1)
25y^2 - 4 = (5y - 2)(5y + 2)
x^2 - 4x + 4 = (x - 2)^2
36a^2 - 60ab + 25b^2 = (6a - 5b)^2
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c^2 - 1 = (c - 1)(c + 1)
25y^2 - 4 = (5y - 2)(5y + 2)
x^2 - 4x + 4 = (x - 2)^2
36a^2 - 60ab + 25b^2 = (6a - 5b)^2
X*x-4x+4
25y*y-4
36a*a-60ab