(a - b)(a + b)

(a + b)^2

2a(a² - b²)

(x + 3)(x - 3)

(x - 3)²

(x + 9)(x + 1)

(x - 9)(x - 1)

(a + 6)(a - 6)

(a - 9)(a - 4)

(a - 12)(a - 3)

(a + 6)^2 

(x - 6)²

(x + 6)²

(x + 2)(x - 6)

(x + 12)(x - 1)

(3x - 2y)(3x + 2y)

(3x + 2y)^2  

(9x - 2y)(x - 2y)

(3x - y)(3x -4y)

(2ab - 1)²  

4(a + b)²  

(4ab + 1)(ab + 1)

(y + 5)(3y + 15)

3(y + 5)(y - 5)

(3y + 25)(y + 3)

(y - 5)^2 

(c^4 + 3)(c^4 - 3)

cannot be factored

(c² - 3)^{4 }

(c^2 - 3)^2

(5x - 1)^2

(5x + 1)^2

cannot be factored

(5x + 1)^2

cannot be factored

(5x + 1)(5x - 1)

cannot be factored

(3m - 10n)²

(3m + 25n)(3m + 4n)

-(3x + 1)^2

(-3x - 1)^2

(-3x + 1)^2

cannot be factored

cannot be factored

(ax + 7a)(x+7)

a(x² + 14x + 49)

(3x - 8y)²

(3x² - 8y²)²

(3x² - 8y⁴)²

cannot be factored