0=7x^2-11x+3

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Solution for 0=7x^2-11x+3 equation:


Simplifying
0 = 7x2 + -11x + 3

Reorder the terms:
0 = 3 + -11x + 7x2

Solving
0 = 3 + -11x + 7x2

Solving for variable 'x'.

Combine like terms: 0 + -3 = -3
-3 + 11x + -7x2 = 3 + -11x + 7x2 + -3 + 11x + -7x2

Reorder the terms:
-3 + 11x + -7x2 = 3 + -3 + -11x + 11x + 7x2 + -7x2

Combine like terms: 3 + -3 = 0
-3 + 11x + -7x2 = 0 + -11x + 11x + 7x2 + -7x2
-3 + 11x + -7x2 = -11x + 11x + 7x2 + -7x2

Combine like terms: -11x + 11x = 0
-3 + 11x + -7x2 = 0 + 7x2 + -7x2
-3 + 11x + -7x2 = 7x2 + -7x2

Combine like terms: 7x2 + -7x2 = 0
-3 + 11x + -7x2 = 0

Begin completing the square.  Divide all terms by
-7 the coefficient of the squared term: 

Divide each side by '-7'.
0.4285714286 + -1.571428571x + x2 = 0

Move the constant term to the right:

Add '-0.4285714286' to each side of the equation.
0.4285714286 + -1.571428571x + -0.4285714286 + x2 = 0 + -0.4285714286

Reorder the terms:
0.4285714286 + -0.4285714286 + -1.571428571x + x2 = 0 + -0.4285714286

Combine like terms: 0.4285714286 + -0.4285714286 = 0.0000000000
0.0000000000 + -1.571428571x + x2 = 0 + -0.4285714286
-1.571428571x + x2 = 0 + -0.4285714286

Combine like terms: 0 + -0.4285714286 = -0.4285714286
-1.571428571x + x2 = -0.4285714286

The x term is -1.571428571x.  Take half its coefficient (-0.7857142855).
Square it (0.6173469384) and add it to both sides.

Add '0.6173469384' to each side of the equation.
-1.571428571x + 0.6173469384 + x2 = -0.4285714286 + 0.6173469384

Reorder the terms:
0.6173469384 + -1.571428571x + x2 = -0.4285714286 + 0.6173469384

Combine like terms: -0.4285714286 + 0.6173469384 = 0.1887755098
0.6173469384 + -1.571428571x + x2 = 0.1887755098

Factor a perfect square on the left side:
(x + -0.7857142855)(x + -0.7857142855) = 0.1887755098

Calculate the square root of the right side: 0.434483037

Break this problem into two subproblems by setting 
(x + -0.7857142855) equal to 0.434483037 and -0.434483037.

Subproblem 1

x + -0.7857142855 = 0.434483037 Simplifying x + -0.7857142855 = 0.434483037 Reorder the terms: -0.7857142855 + x = 0.434483037 Solving -0.7857142855 + x = 0.434483037 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7857142855' to each side of the equation. -0.7857142855 + 0.7857142855 + x = 0.434483037 + 0.7857142855 Combine like terms: -0.7857142855 + 0.7857142855 = 0.0000000000 0.0000000000 + x = 0.434483037 + 0.7857142855 x = 0.434483037 + 0.7857142855 Combine like terms: 0.434483037 + 0.7857142855 = 1.2201973225 x = 1.2201973225 Simplifying x = 1.2201973225

Subproblem 2

x + -0.7857142855 = -0.434483037 Simplifying x + -0.7857142855 = -0.434483037 Reorder the terms: -0.7857142855 + x = -0.434483037 Solving -0.7857142855 + x = -0.434483037 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7857142855' to each side of the equation. -0.7857142855 + 0.7857142855 + x = -0.434483037 + 0.7857142855 Combine like terms: -0.7857142855 + 0.7857142855 = 0.0000000000 0.0000000000 + x = -0.434483037 + 0.7857142855 x = -0.434483037 + 0.7857142855 Combine like terms: -0.434483037 + 0.7857142855 = 0.3512312485 x = 0.3512312485 Simplifying x = 0.3512312485

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.2201973225, 0.3512312485}

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