You need to know the value of x
8
The quadratic expression x2+6x+8 when factorised equals (x+2)(x+4)
x2 - 9x = -8 ∴ x2 - 9x + 8 = 0 ∴ (x - 1)(x - 8) = 0 You can then solve it as well: ∴ x ∈ {1, 8}
x2-8x=0 ( add 8x to both sides) x2 =8x (divide by x) x=8 ( x2divided by x equals x)
You need to know the value of x
8
X = 8 x2 (8)2 = 64 ====
if x2 = 5 the value of x has to be 5 divided by 2 which is 2.5 x = 2.5
The quadratic expression x2+6x+8 when factorised equals (x+2)(x+4)
x2 - 9x = -8 ∴ x2 - 9x + 8 = 0 ∴ (x - 1)(x - 8) = 0 You can then solve it as well: ∴ x ∈ {1, 8}
x2-8x=0 ( add 8x to both sides) x2 =8x (divide by x) x=8 ( x2divided by x equals x)
x2 = 8xx2- 8x = 0x(x - 8) = 0x = 0 ;x - 8 = 0x = 8
Assuming that what you're looking for is the values of x: x2 + 7x = 8 x2 + 7x - 8 = 0 (x + 8)(x - 1) = 0 x is equal to either -8 or 1.
x=8
(x-9)(X+8)
x=5/2 or 2.5