(5+5) + (5-5) + (5 + 5 - 5) + (5 x 0) =
10 + 0 + 5 + 0 = 15
Assuming you wish to make this equation equal zero, for x2 + 16x + 55 = 0, x = -5.
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
(x - 5)(x - 11)
X should be zeroas:X + 5 = 2X + 5so, 2X - X = 0 or X = 0
x=0
x2 - 2x + 55 = 90x2 - 2x - 35 = 0(x+5)(x-7) = 0x = -5, 7
5*5*5=75 75-75=0 0-55=-55 -55*0=0 the answer is 0
Assuming you wish to make this equation equal zero, for x2 + 16x + 55 = 0, x = -5.
5 + 5 + 5 - 5 + 5 + 5 - 5 + (5 x 0) = 15
x+4x+5 = 0 5x + 5 = 0 5x = -5 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
(x - 5)(x - 11)
(x+4)(x+5) = 0 x = -4 v x= -5 However this can also be an answer: (x+4)(x+5) = 0 x2 + 9x + 20 = 0
X should be zeroas:X + 5 = 2X + 5so, 2X - X = 0 or X = 0
-5
x=0
x2 + 9x + 20 = 0 ∴(x + 4)(x + 5) = 0 ∴x ∈ {-5, -4}