5x2 + 20x = 0 5x(x + 4) = 0 x = 0 and -4
4x2+20x+25 (2x+5)^2
5x2 + 3x - 1 does not have rational factors.
5x2-46x+9 = (5x-1)(x-9)
x(5x + 7)
5x(x+3)
5x2-18x+9 = (5x-3)(x-3)
(x + 2)(5x + 13)
ça ne marche pas...
(20x + 3)(1x + 1)
The GCF is 5x2
(x + 15)(x + 5)