3x^2-88x-18=0

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Solution for 3x^2-88x-18=0 equation:


Simplifying
3x2 + -88x + -18 = 0

Reorder the terms:
-18 + -88x + 3x2 = 0

Solving
-18 + -88x + 3x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
3 the coefficient of the squared term: 

Divide each side by '3'.
-6 + -29.33333333x + x2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + -29.33333333x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + -29.33333333x + x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -29.33333333x + x2 = 0 + 6
-29.33333333x + x2 = 0 + 6

Combine like terms: 0 + 6 = 6
-29.33333333x + x2 = 6

The x term is -29.33333333x.  Take half its coefficient (-14.66666667).
Square it (215.1111112) and add it to both sides.

Add '215.1111112' to each side of the equation.
-29.33333333x + 215.1111112 + x2 = 6 + 215.1111112

Reorder the terms:
215.1111112 + -29.33333333x + x2 = 6 + 215.1111112

Combine like terms: 6 + 215.1111112 = 221.1111112
215.1111112 + -29.33333333x + x2 = 221.1111112

Factor a perfect square on the left side:
(x + -14.66666667)(x + -14.66666667) = 221.1111112

Calculate the square root of the right side: 14.869805352

Break this problem into two subproblems by setting 
(x + -14.66666667) equal to 14.869805352 and -14.869805352.

Subproblem 1

x + -14.66666667 = 14.869805352 Simplifying x + -14.66666667 = 14.869805352 Reorder the terms: -14.66666667 + x = 14.869805352 Solving -14.66666667 + x = 14.869805352 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '14.66666667' to each side of the equation. -14.66666667 + 14.66666667 + x = 14.869805352 + 14.66666667 Combine like terms: -14.66666667 + 14.66666667 = 0.00000000 0.00000000 + x = 14.869805352 + 14.66666667 x = 14.869805352 + 14.66666667 Combine like terms: 14.869805352 + 14.66666667 = 29.536472022 x = 29.536472022 Simplifying x = 29.536472022

Subproblem 2

x + -14.66666667 = -14.869805352 Simplifying x + -14.66666667 = -14.869805352 Reorder the terms: -14.66666667 + x = -14.869805352 Solving -14.66666667 + x = -14.869805352 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '14.66666667' to each side of the equation. -14.66666667 + 14.66666667 + x = -14.869805352 + 14.66666667 Combine like terms: -14.66666667 + 14.66666667 = 0.00000000 0.00000000 + x = -14.869805352 + 14.66666667 x = -14.869805352 + 14.66666667 Combine like terms: -14.869805352 + 14.66666667 = -0.203138682 x = -0.203138682 Simplifying x = -0.203138682

Solution

The solution to the problem is based on the solutions from the subproblems. x = {29.536472022, -0.203138682}

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