x2-81 = (x-9)(x+9)
(x - 3)(x + 3)
(a + 3)(a - 3)
(9 - 5u)(9 + 5u)
The discriminant of this quadratic expression is less than zero therefore it cannot be factored.
(x + 2)(x - 9)
(7x + 8)(7x - 9)
9(2x - 1)(2x + 1)
(10x-3(10x+3)
(x - 1)(2x - 9)
1x^2-6x+91X9 IS 9What multiplies to get 9 and adds to get -6? -3x-3So, (x-3)(x-3)
(8x - 3)(8x + 3)