14x^2+4x-7=4

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Solution for 14x^2+4x-7=4 equation:


Simplifying
14x2 + 4x + -7 = 4

Reorder the terms:
-7 + 4x + 14x2 = 4

Solving
-7 + 4x + 14x2 = 4

Solving for variable 'x'.

Reorder the terms:
-7 + -4 + 4x + 14x2 = 4 + -4

Combine like terms: -7 + -4 = -11
-11 + 4x + 14x2 = 4 + -4

Combine like terms: 4 + -4 = 0
-11 + 4x + 14x2 = 0

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

Divide each side by '14'.
-0.7857142857 + 0.2857142857x + x2 = 0

Move the constant term to the right:

Add '0.7857142857' to each side of the equation.
-0.7857142857 + 0.2857142857x + 0.7857142857 + x2 = 0 + 0.7857142857

Reorder the terms:
-0.7857142857 + 0.7857142857 + 0.2857142857x + x2 = 0 + 0.7857142857

Combine like terms: -0.7857142857 + 0.7857142857 = 0.0000000000
0.0000000000 + 0.2857142857x + x2 = 0 + 0.7857142857
0.2857142857x + x2 = 0 + 0.7857142857

Combine like terms: 0 + 0.7857142857 = 0.7857142857
0.2857142857x + x2 = 0.7857142857

The x term is 0.2857142857x.  Take half its coefficient (0.1428571429).
Square it (0.02040816328) and add it to both sides.

Add '0.02040816328' to each side of the equation.
0.2857142857x + 0.02040816328 + x2 = 0.7857142857 + 0.02040816328

Reorder the terms:
0.02040816328 + 0.2857142857x + x2 = 0.7857142857 + 0.02040816328

Combine like terms: 0.7857142857 + 0.02040816328 = 0.80612244898
0.02040816328 + 0.2857142857x + x2 = 0.80612244898

Factor a perfect square on the left side:
(x + 0.1428571429)(x + 0.1428571429) = 0.80612244898

Calculate the square root of the right side: 0.897843221

Break this problem into two subproblems by setting 
(x + 0.1428571429) equal to 0.897843221 and -0.897843221.

Subproblem 1

x + 0.1428571429 = 0.897843221 Simplifying x + 0.1428571429 = 0.897843221 Reorder the terms: 0.1428571429 + x = 0.897843221 Solving 0.1428571429 + x = 0.897843221 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1428571429' to each side of the equation. 0.1428571429 + -0.1428571429 + x = 0.897843221 + -0.1428571429 Combine like terms: 0.1428571429 + -0.1428571429 = 0.0000000000 0.0000000000 + x = 0.897843221 + -0.1428571429 x = 0.897843221 + -0.1428571429 Combine like terms: 0.897843221 + -0.1428571429 = 0.7549860781 x = 0.7549860781 Simplifying x = 0.7549860781

Subproblem 2

x + 0.1428571429 = -0.897843221 Simplifying x + 0.1428571429 = -0.897843221 Reorder the terms: 0.1428571429 + x = -0.897843221 Solving 0.1428571429 + x = -0.897843221 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1428571429' to each side of the equation. 0.1428571429 + -0.1428571429 + x = -0.897843221 + -0.1428571429 Combine like terms: 0.1428571429 + -0.1428571429 = 0.0000000000 0.0000000000 + x = -0.897843221 + -0.1428571429 x = -0.897843221 + -0.1428571429 Combine like terms: -0.897843221 + -0.1428571429 = -1.0407003639 x = -1.0407003639 Simplifying x = -1.0407003639

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.7549860781, -1.0407003639}

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