6x^2+5=-4x+8

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Solution for 6x^2+5=-4x+8 equation:


Simplifying
6x2 + 5 = -4x + 8

Reorder the terms:
5 + 6x2 = -4x + 8

Reorder the terms:
5 + 6x2 = 8 + -4x

Solving
5 + 6x2 = 8 + -4x

Solving for variable 'x'.

Reorder the terms:
5 + -8 + 4x + 6x2 = 8 + -4x + -8 + 4x

Combine like terms: 5 + -8 = -3
-3 + 4x + 6x2 = 8 + -4x + -8 + 4x

Reorder the terms:
-3 + 4x + 6x2 = 8 + -8 + -4x + 4x

Combine like terms: 8 + -8 = 0
-3 + 4x + 6x2 = 0 + -4x + 4x
-3 + 4x + 6x2 = -4x + 4x

Combine like terms: -4x + 4x = 0
-3 + 4x + 6x2 = 0

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

Divide each side by '6'.
-0.5 + 0.6666666667x + x2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + 0.6666666667x + 0.5 + x2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + 0.6666666667x + x2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + 0.6666666667x + x2 = 0 + 0.5
0.6666666667x + x2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
0.6666666667x + x2 = 0.5

The x term is 0.6666666667x.  Take half its coefficient (0.3333333334).
Square it (0.1111111112) and add it to both sides.

Add '0.1111111112' to each side of the equation.
0.6666666667x + 0.1111111112 + x2 = 0.5 + 0.1111111112

Reorder the terms:
0.1111111112 + 0.6666666667x + x2 = 0.5 + 0.1111111112

Combine like terms: 0.5 + 0.1111111112 = 0.6111111112
0.1111111112 + 0.6666666667x + x2 = 0.6111111112

Factor a perfect square on the left side:
(x + 0.3333333334)(x + 0.3333333334) = 0.6111111112

Calculate the square root of the right side: 0.78173596

Break this problem into two subproblems by setting 
(x + 0.3333333334) equal to 0.78173596 and -0.78173596.

Subproblem 1

x + 0.3333333334 = 0.78173596 Simplifying x + 0.3333333334 = 0.78173596 Reorder the terms: 0.3333333334 + x = 0.78173596 Solving 0.3333333334 + x = 0.78173596 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3333333334' to each side of the equation. 0.3333333334 + -0.3333333334 + x = 0.78173596 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + x = 0.78173596 + -0.3333333334 x = 0.78173596 + -0.3333333334 Combine like terms: 0.78173596 + -0.3333333334 = 0.4484026266 x = 0.4484026266 Simplifying x = 0.4484026266

Subproblem 2

x + 0.3333333334 = -0.78173596 Simplifying x + 0.3333333334 = -0.78173596 Reorder the terms: 0.3333333334 + x = -0.78173596 Solving 0.3333333334 + x = -0.78173596 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3333333334' to each side of the equation. 0.3333333334 + -0.3333333334 + x = -0.78173596 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + x = -0.78173596 + -0.3333333334 x = -0.78173596 + -0.3333333334 Combine like terms: -0.78173596 + -0.3333333334 = -1.1150692934 x = -1.1150692934 Simplifying x = -1.1150692934

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.4484026266, -1.1150692934}

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