The quadratic expression x2+6x+8 when factorised equals (x+2)(x+4)
one
(3, -21)
y = x2 - 6x + 2 y = x2 - 6x + 9 - 7 y = (x - 3)2 - 7
(x-5)(x+11)
The quadratic expression x2+6x+8 when factorised equals (x+2)(x+4)
x2 + 6x + 9 = 81 x2 + 6x = 72 x2 + 6x - 72 = 0 (x+12)(x-6) = 0 x= -12, 6 (two solutions)
x2 + 6x + 12 = 0 x2 + 6x + 9 = -3 (x + 3)2 = -3 x + 3 = ± √-3 x = -3 ± i√3
one
(3, -21)
y ≥ 11
x2 + 6x - 2 = 0 x2 + 6x + 9 = 13 (x + 3)2 = 13 x + 3 = ± √13 x = -3 ± √13
y = x2 - 6x + 2 y = x2 - 6x + 9 - 7 y = (x - 3)2 - 7
A quadratic equation. If you wish to solve for x, you can do so as follows: -x2 + 6x + 7 = 0 x2 - 6x - 7 = 0 (x - 7)(x + 1) = 0 x ∈ {-1, 7}
2x+6x=-9 => 8x=-9=> x=-8/9
(x-5)(x+11)
x2 + 6x + 8 = 0 Solve for x.X = -2 or X = -4