It is: 50*50*0+1 = 1
X + 1 - x - 1 = 0, for all x. Regroup: (x - x) + (1 - 1) = 0 + 0.
x^2 + x = 0 x(x+1) = 0 x = 0 and x = -1
x = -1/2 or -5 2x2 + 11x + 5 = 0 ⇒ (2x + 1)(x + 5) = 0 ⇒ (2x + 1) = 0 → x = -1/2 or (x + 5) = 0 → x = -5
(because zero time 1= 0 plus 1)
(x + 6)(x + 1) = 0 so x = either -1 or -6