x^3+ax^2+bx+8=0

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Solution for x^3+ax^2+bx+8=0 equation:


Simplifying
x3 + ax2 + bx + 8 = 0

Reorder the terms:
8 + ax2 + bx + x3 = 0

Solving
8 + ax2 + bx + x3 = 0

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '-8' to each side of the equation.
8 + ax2 + bx + -8 + x3 = 0 + -8

Reorder the terms:
8 + -8 + ax2 + bx + x3 = 0 + -8

Combine like terms: 8 + -8 = 0
0 + ax2 + bx + x3 = 0 + -8
ax2 + bx + x3 = 0 + -8

Combine like terms: 0 + -8 = -8
ax2 + bx + x3 = -8

Add '-1bx' to each side of the equation.
ax2 + bx + -1bx + x3 = -8 + -1bx

Combine like terms: bx + -1bx = 0
ax2 + 0 + x3 = -8 + -1bx
ax2 + x3 = -8 + -1bx

Add '-1x3' to each side of the equation.
ax2 + x3 + -1x3 = -8 + -1bx + -1x3

Combine like terms: x3 + -1x3 = 0
ax2 + 0 = -8 + -1bx + -1x3
ax2 = -8 + -1bx + -1x3

Divide each side by 'x2'.
a = -8x-2 + -1bx-1 + -1x

Simplifying
a = -8x-2 + -1bx-1 + -1x

Reorder the terms:
a = -1bx-1 + -8x-2 + -1x

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