6x^2=-8+15x

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Solution for 6x^2=-8+15x equation:


Simplifying
6x2 = -8 + 15x

Solving
6x2 = -8 + 15x

Solving for variable 'x'.

Reorder the terms:
8 + -15x + 6x2 = -8 + 15x + 8 + -15x

Reorder the terms:
8 + -15x + 6x2 = -8 + 8 + 15x + -15x

Combine like terms: -8 + 8 = 0
8 + -15x + 6x2 = 0 + 15x + -15x
8 + -15x + 6x2 = 15x + -15x

Combine like terms: 15x + -15x = 0
8 + -15x + 6x2 = 0

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

Divide each side by '6'.
1.333333333 + -2.5x + x2 = 0

Move the constant term to the right:

Add '-1.333333333' to each side of the equation.
1.333333333 + -2.5x + -1.333333333 + x2 = 0 + -1.333333333

Reorder the terms:
1.333333333 + -1.333333333 + -2.5x + x2 = 0 + -1.333333333

Combine like terms: 1.333333333 + -1.333333333 = 0.000000000
0.000000000 + -2.5x + x2 = 0 + -1.333333333
-2.5x + x2 = 0 + -1.333333333

Combine like terms: 0 + -1.333333333 = -1.333333333
-2.5x + x2 = -1.333333333

The x term is -2.5x.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5x + 1.5625 + x2 = -1.333333333 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = -1.333333333 + 1.5625

Combine like terms: -1.333333333 + 1.5625 = 0.229166667
1.5625 + -2.5x + x2 = 0.229166667

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = 0.229166667

Calculate the square root of the right side: 0.478713554

Break this problem into two subproblems by setting 
(x + -1.25) equal to 0.478713554 and -0.478713554.

Subproblem 1

x + -1.25 = 0.478713554 Simplifying x + -1.25 = 0.478713554 Reorder the terms: -1.25 + x = 0.478713554 Solving -1.25 + x = 0.478713554 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = 0.478713554 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 0.478713554 + 1.25 x = 0.478713554 + 1.25 Combine like terms: 0.478713554 + 1.25 = 1.728713554 x = 1.728713554 Simplifying x = 1.728713554

Subproblem 2

x + -1.25 = -0.478713554 Simplifying x + -1.25 = -0.478713554 Reorder the terms: -1.25 + x = -0.478713554 Solving -1.25 + x = -0.478713554 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = -0.478713554 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = -0.478713554 + 1.25 x = -0.478713554 + 1.25 Combine like terms: -0.478713554 + 1.25 = 0.771286446 x = 0.771286446 Simplifying x = 0.771286446

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.728713554, 0.771286446}

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