5.39x+12.97x^2-6.44-8.47x^2-8.91=

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Solution for 5.39x+12.97x^2-6.44-8.47x^2-8.91= equation:


Simplifying
5.39x + 12.97x2 + -6.44 + -8.47x2 + -8.91 = 0

Reorder the terms:
-6.44 + -8.91 + 5.39x + 12.97x2 + -8.47x2 = 0

Combine like terms: -6.44 + -8.91 = -15.35
-15.35 + 5.39x + 12.97x2 + -8.47x2 = 0

Combine like terms: 12.97x2 + -8.47x2 = 4.5x2
-15.35 + 5.39x + 4.5x2 = 0

Solving
-15.35 + 5.39x + 4.5x2 = 0

Solving for variable 'x'.

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

Divide each side by '4.5'.
-3.411111111 + 1.197777778x + x2 = 0

Move the constant term to the right:

Add '3.411111111' to each side of the equation.
-3.411111111 + 1.197777778x + 3.411111111 + x2 = 0 + 3.411111111

Reorder the terms:
-3.411111111 + 3.411111111 + 1.197777778x + x2 = 0 + 3.411111111

Combine like terms: -3.411111111 + 3.411111111 = 0.000000000
0.000000000 + 1.197777778x + x2 = 0 + 3.411111111
1.197777778x + x2 = 0 + 3.411111111

Combine like terms: 0 + 3.411111111 = 3.411111111
1.197777778x + x2 = 3.411111111

The x term is 1.197777778x.  Take half its coefficient (0.598888889).
Square it (0.3586679014) and add it to both sides.

Add '0.3586679014' to each side of the equation.
1.197777778x + 0.3586679014 + x2 = 3.411111111 + 0.3586679014

Reorder the terms:
0.3586679014 + 1.197777778x + x2 = 3.411111111 + 0.3586679014

Combine like terms: 3.411111111 + 0.3586679014 = 3.7697790124
0.3586679014 + 1.197777778x + x2 = 3.7697790124

Factor a perfect square on the left side:
(x + 0.598888889)(x + 0.598888889) = 3.7697790124

Calculate the square root of the right side: 1.941591876

Break this problem into two subproblems by setting 
(x + 0.598888889) equal to 1.941591876 and -1.941591876.

Subproblem 1

x + 0.598888889 = 1.941591876 Simplifying x + 0.598888889 = 1.941591876 Reorder the terms: 0.598888889 + x = 1.941591876 Solving 0.598888889 + x = 1.941591876 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.598888889' to each side of the equation. 0.598888889 + -0.598888889 + x = 1.941591876 + -0.598888889 Combine like terms: 0.598888889 + -0.598888889 = 0.000000000 0.000000000 + x = 1.941591876 + -0.598888889 x = 1.941591876 + -0.598888889 Combine like terms: 1.941591876 + -0.598888889 = 1.342702987 x = 1.342702987 Simplifying x = 1.342702987

Subproblem 2

x + 0.598888889 = -1.941591876 Simplifying x + 0.598888889 = -1.941591876 Reorder the terms: 0.598888889 + x = -1.941591876 Solving 0.598888889 + x = -1.941591876 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.598888889' to each side of the equation. 0.598888889 + -0.598888889 + x = -1.941591876 + -0.598888889 Combine like terms: 0.598888889 + -0.598888889 = 0.000000000 0.000000000 + x = -1.941591876 + -0.598888889 x = -1.941591876 + -0.598888889 Combine like terms: -1.941591876 + -0.598888889 = -2.540480765 x = -2.540480765 Simplifying x = -2.540480765

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.342702987, -2.540480765}

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