5x^2+4x-14=0

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Solution for 5x^2+4x-14=0 equation:


Simplifying
5x2 + 4x + -14 = 0

Reorder the terms:
-14 + 4x + 5x2 = 0

Solving
-14 + 4x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-2.8 + 0.8x + x2 = 0

Move the constant term to the right:

Add '2.8' to each side of the equation.
-2.8 + 0.8x + 2.8 + x2 = 0 + 2.8

Reorder the terms:
-2.8 + 2.8 + 0.8x + x2 = 0 + 2.8

Combine like terms: -2.8 + 2.8 = 0.0
0.0 + 0.8x + x2 = 0 + 2.8
0.8x + x2 = 0 + 2.8

Combine like terms: 0 + 2.8 = 2.8
0.8x + x2 = 2.8

The x term is 0.8x.  Take half its coefficient (0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
0.8x + 0.16 + x2 = 2.8 + 0.16

Reorder the terms:
0.16 + 0.8x + x2 = 2.8 + 0.16

Combine like terms: 2.8 + 0.16 = 2.96
0.16 + 0.8x + x2 = 2.96

Factor a perfect square on the left side:
(x + 0.4)(x + 0.4) = 2.96

Calculate the square root of the right side: 1.720465053

Break this problem into two subproblems by setting 
(x + 0.4) equal to 1.720465053 and -1.720465053.

Subproblem 1

x + 0.4 = 1.720465053 Simplifying x + 0.4 = 1.720465053 Reorder the terms: 0.4 + x = 1.720465053 Solving 0.4 + x = 1.720465053 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = 1.720465053 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = 1.720465053 + -0.4 x = 1.720465053 + -0.4 Combine like terms: 1.720465053 + -0.4 = 1.320465053 x = 1.320465053 Simplifying x = 1.320465053

Subproblem 2

x + 0.4 = -1.720465053 Simplifying x + 0.4 = -1.720465053 Reorder the terms: 0.4 + x = -1.720465053 Solving 0.4 + x = -1.720465053 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = -1.720465053 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = -1.720465053 + -0.4 x = -1.720465053 + -0.4 Combine like terms: -1.720465053 + -0.4 = -2.120465053 x = -2.120465053 Simplifying x = -2.120465053

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.320465053, -2.120465053}

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