7x^2=1-3x

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Solution for 7x^2=1-3x equation:


Simplifying
7x2 = 1 + -3x

Solving
7x2 = 1 + -3x

Solving for variable 'x'.

Reorder the terms:
-1 + 3x + 7x2 = 1 + -3x + -1 + 3x

Reorder the terms:
-1 + 3x + 7x2 = 1 + -1 + -3x + 3x

Combine like terms: 1 + -1 = 0
-1 + 3x + 7x2 = 0 + -3x + 3x
-1 + 3x + 7x2 = -3x + 3x

Combine like terms: -3x + 3x = 0
-1 + 3x + 7x2 = 0

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

Divide each side by '7'.
-0.1428571429 + 0.4285714286x + x2 = 0

Move the constant term to the right:

Add '0.1428571429' to each side of the equation.
-0.1428571429 + 0.4285714286x + 0.1428571429 + x2 = 0 + 0.1428571429

Reorder the terms:
-0.1428571429 + 0.1428571429 + 0.4285714286x + x2 = 0 + 0.1428571429

Combine like terms: -0.1428571429 + 0.1428571429 = 0.0000000000
0.0000000000 + 0.4285714286x + x2 = 0 + 0.1428571429
0.4285714286x + x2 = 0 + 0.1428571429

Combine like terms: 0 + 0.1428571429 = 0.1428571429
0.4285714286x + x2 = 0.1428571429

The x term is 0.4285714286x.  Take half its coefficient (0.2142857143).
Square it (0.04591836735) and add it to both sides.

Add '0.04591836735' to each side of the equation.
0.4285714286x + 0.04591836735 + x2 = 0.1428571429 + 0.04591836735

Reorder the terms:
0.04591836735 + 0.4285714286x + x2 = 0.1428571429 + 0.04591836735

Combine like terms: 0.1428571429 + 0.04591836735 = 0.18877551025
0.04591836735 + 0.4285714286x + x2 = 0.18877551025

Factor a perfect square on the left side:
(x + 0.2142857143)(x + 0.2142857143) = 0.18877551025

Calculate the square root of the right side: 0.434483038

Break this problem into two subproblems by setting 
(x + 0.2142857143) equal to 0.434483038 and -0.434483038.

Subproblem 1

x + 0.2142857143 = 0.434483038 Simplifying x + 0.2142857143 = 0.434483038 Reorder the terms: 0.2142857143 + x = 0.434483038 Solving 0.2142857143 + x = 0.434483038 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2142857143' to each side of the equation. 0.2142857143 + -0.2142857143 + x = 0.434483038 + -0.2142857143 Combine like terms: 0.2142857143 + -0.2142857143 = 0.0000000000 0.0000000000 + x = 0.434483038 + -0.2142857143 x = 0.434483038 + -0.2142857143 Combine like terms: 0.434483038 + -0.2142857143 = 0.2201973237 x = 0.2201973237 Simplifying x = 0.2201973237

Subproblem 2

x + 0.2142857143 = -0.434483038 Simplifying x + 0.2142857143 = -0.434483038 Reorder the terms: 0.2142857143 + x = -0.434483038 Solving 0.2142857143 + x = -0.434483038 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2142857143' to each side of the equation. 0.2142857143 + -0.2142857143 + x = -0.434483038 + -0.2142857143 Combine like terms: 0.2142857143 + -0.2142857143 = 0.0000000000 0.0000000000 + x = -0.434483038 + -0.2142857143 x = -0.434483038 + -0.2142857143 Combine like terms: -0.434483038 + -0.2142857143 = -0.6487687523 x = -0.6487687523 Simplifying x = -0.6487687523

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.2201973237, -0.6487687523}

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