3x^2+8x=1230

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Solution for 3x^2+8x=1230 equation:


Simplifying
3x2 + 8x = 1230

Reorder the terms:
8x + 3x2 = 1230

Solving
8x + 3x2 = 1230

Solving for variable 'x'.

Reorder the terms:
-1230 + 8x + 3x2 = 1230 + -1230

Combine like terms: 1230 + -1230 = 0
-1230 + 8x + 3x2 = 0

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

Divide each side by '3'.
-410 + 2.666666667x + x2 = 0

Move the constant term to the right:

Add '410' to each side of the equation.
-410 + 2.666666667x + 410 + x2 = 0 + 410

Reorder the terms:
-410 + 410 + 2.666666667x + x2 = 0 + 410

Combine like terms: -410 + 410 = 0
0 + 2.666666667x + x2 = 0 + 410
2.666666667x + x2 = 0 + 410

Combine like terms: 0 + 410 = 410
2.666666667x + x2 = 410

The x term is 2.666666667x.  Take half its coefficient (1.333333334).
Square it (1.777777780) and add it to both sides.

Add '1.777777780' to each side of the equation.
2.666666667x + 1.777777780 + x2 = 410 + 1.777777780

Reorder the terms:
1.777777780 + 2.666666667x + x2 = 410 + 1.777777780

Combine like terms: 410 + 1.777777780 = 411.77777778
1.777777780 + 2.666666667x + x2 = 411.77777778

Factor a perfect square on the left side:
(x + 1.333333334)(x + 1.333333334) = 411.77777778

Calculate the square root of the right side: 20.29230834

Break this problem into two subproblems by setting 
(x + 1.333333334) equal to 20.29230834 and -20.29230834.

Subproblem 1

x + 1.333333334 = 20.29230834 Simplifying x + 1.333333334 = 20.29230834 Reorder the terms: 1.333333334 + x = 20.29230834 Solving 1.333333334 + x = 20.29230834 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + x = 20.29230834 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = 20.29230834 + -1.333333334 x = 20.29230834 + -1.333333334 Combine like terms: 20.29230834 + -1.333333334 = 18.958975006 x = 18.958975006 Simplifying x = 18.958975006

Subproblem 2

x + 1.333333334 = -20.29230834 Simplifying x + 1.333333334 = -20.29230834 Reorder the terms: 1.333333334 + x = -20.29230834 Solving 1.333333334 + x = -20.29230834 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + x = -20.29230834 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = -20.29230834 + -1.333333334 x = -20.29230834 + -1.333333334 Combine like terms: -20.29230834 + -1.333333334 = -21.625641674 x = -21.625641674 Simplifying x = -21.625641674

Solution

The solution to the problem is based on the solutions from the subproblems. x = {18.958975006, -21.625641674}

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