Solving an equation of the third degree
First, the path difference between the cubes
Example
x ³ -8 = 0
Untangled to the corner arc small and large arc and Port 3 x untangled to X and X Squared
And untangled 8 to 2 in 4
(x-2) (x ² 2x 4) = 0
And reduce East in a big bow consists of hitting first double edged sword in some
And here in the order signals
Always positive, such as reverse
Any indication of -8, and took it like a reverse then always positive
Then we have a double-edged equate each big zero and reduce solve common law
x-2 = 0 x = 2
x ² 2x 4 = 0
X-squared coefficient 1
X-factor 2
The absolute limit 4
And compensate in-law
x = (-b ± √ b ²-4ac) / 2a
x = (-2 ± √ 4-4 * 1 * 4) / 2 * 1
This equation can not be solved because under the root is negative and this is unacceptable mathematically not
Solves only preparing the vehicle
If the solution is
x = 2
II Analysis manner of division
Example
4x ³ 4x ² 5x 5 = 0
Joint working smoke
(4x ³ 4x ²) (5x 5) = 0
4x ² (x 1) 5 (x 1) = 0
(4x ² 5) (x 1) = 0
x 1 = 0 x = -1
4x ² 5 = 0 x ² = -5 / 4 equation is rejected
x = -1 is the solution
To make sure sub in the equation
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