1.3x+0.2=0.7x^2

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Solution for 1.3x+0.2=0.7x^2 equation:


Simplifying
1.3x + 0.2 = 0.7x2

Reorder the terms:
0.2 + 1.3x = 0.7x2

Solving
0.2 + 1.3x = 0.7x2

Solving for variable 'x'.

Combine like terms: 0.7x2 + -0.7x2 = 0.0
0.2 + 1.3x + -0.7x2 = 0.0

Begin completing the square.  Divide all terms by
-0.7 the coefficient of the squared term: 

Divide each side by '-0.7'.
-0.2857142857 + -1.857142857x + x2 = 0

Move the constant term to the right:

Add '0.2857142857' to each side of the equation.
-0.2857142857 + -1.857142857x + 0.2857142857 + x2 = 0 + 0.2857142857

Reorder the terms:
-0.2857142857 + 0.2857142857 + -1.857142857x + x2 = 0 + 0.2857142857

Combine like terms: -0.2857142857 + 0.2857142857 = 0.0000000000
0.0000000000 + -1.857142857x + x2 = 0 + 0.2857142857
-1.857142857x + x2 = 0 + 0.2857142857

Combine like terms: 0 + 0.2857142857 = 0.2857142857
-1.857142857x + x2 = 0.2857142857

The x term is -1.857142857x.  Take half its coefficient (-0.9285714285).
Square it (0.8622448978) and add it to both sides.

Add '0.8622448978' to each side of the equation.
-1.857142857x + 0.8622448978 + x2 = 0.2857142857 + 0.8622448978

Reorder the terms:
0.8622448978 + -1.857142857x + x2 = 0.2857142857 + 0.8622448978

Combine like terms: 0.2857142857 + 0.8622448978 = 1.1479591835
0.8622448978 + -1.857142857x + x2 = 1.1479591835

Factor a perfect square on the left side:
(x + -0.9285714285)(x + -0.9285714285) = 1.1479591835

Calculate the square root of the right side: 1.071428571

Break this problem into two subproblems by setting 
(x + -0.9285714285) equal to 1.071428571 and -1.071428571.

Subproblem 1

x + -0.9285714285 = 1.071428571 Simplifying x + -0.9285714285 = 1.071428571 Reorder the terms: -0.9285714285 + x = 1.071428571 Solving -0.9285714285 + x = 1.071428571 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9285714285' to each side of the equation. -0.9285714285 + 0.9285714285 + x = 1.071428571 + 0.9285714285 Combine like terms: -0.9285714285 + 0.9285714285 = 0.0000000000 0.0000000000 + x = 1.071428571 + 0.9285714285 x = 1.071428571 + 0.9285714285 Combine like terms: 1.071428571 + 0.9285714285 = 1.9999999995 x = 1.9999999995 Simplifying x = 1.9999999995

Subproblem 2

x + -0.9285714285 = -1.071428571 Simplifying x + -0.9285714285 = -1.071428571 Reorder the terms: -0.9285714285 + x = -1.071428571 Solving -0.9285714285 + x = -1.071428571 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9285714285' to each side of the equation. -0.9285714285 + 0.9285714285 + x = -1.071428571 + 0.9285714285 Combine like terms: -0.9285714285 + 0.9285714285 = 0.0000000000 0.0000000000 + x = -1.071428571 + 0.9285714285 x = -1.071428571 + 0.9285714285 Combine like terms: -1.071428571 + 0.9285714285 = -0.1428571425 x = -0.1428571425 Simplifying x = -0.1428571425

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.9999999995, -0.1428571425}

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