5x^2-14x-12=0

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Solution for 5x^2-14x-12=0 equation:


Simplifying
5x2 + -14x + -12 = 0

Reorder the terms:
-12 + -14x + 5x2 = 0

Solving
-12 + -14x + 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'.
-2.4 + -2.8x + x2 = 0

Move the constant term to the right:

Add '2.4' to each side of the equation.
-2.4 + -2.8x + 2.4 + x2 = 0 + 2.4

Reorder the terms:
-2.4 + 2.4 + -2.8x + x2 = 0 + 2.4

Combine like terms: -2.4 + 2.4 = 0.0
0.0 + -2.8x + x2 = 0 + 2.4
-2.8x + x2 = 0 + 2.4

Combine like terms: 0 + 2.4 = 2.4
-2.8x + x2 = 2.4

The x term is -2.8x.  Take half its coefficient (-1.4).
Square it (1.96) and add it to both sides.

Add '1.96' to each side of the equation.
-2.8x + 1.96 + x2 = 2.4 + 1.96

Reorder the terms:
1.96 + -2.8x + x2 = 2.4 + 1.96

Combine like terms: 2.4 + 1.96 = 4.36
1.96 + -2.8x + x2 = 4.36

Factor a perfect square on the left side:
(x + -1.4)(x + -1.4) = 4.36

Calculate the square root of the right side: 2.088061302

Break this problem into two subproblems by setting 
(x + -1.4) equal to 2.088061302 and -2.088061302.

Subproblem 1

x + -1.4 = 2.088061302 Simplifying x + -1.4 = 2.088061302 Reorder the terms: -1.4 + x = 2.088061302 Solving -1.4 + x = 2.088061302 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.4' to each side of the equation. -1.4 + 1.4 + x = 2.088061302 + 1.4 Combine like terms: -1.4 + 1.4 = 0.0 0.0 + x = 2.088061302 + 1.4 x = 2.088061302 + 1.4 Combine like terms: 2.088061302 + 1.4 = 3.488061302 x = 3.488061302 Simplifying x = 3.488061302

Subproblem 2

x + -1.4 = -2.088061302 Simplifying x + -1.4 = -2.088061302 Reorder the terms: -1.4 + x = -2.088061302 Solving -1.4 + x = -2.088061302 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.4' to each side of the equation. -1.4 + 1.4 + x = -2.088061302 + 1.4 Combine like terms: -1.4 + 1.4 = 0.0 0.0 + x = -2.088061302 + 1.4 x = -2.088061302 + 1.4 Combine like terms: -2.088061302 + 1.4 = -0.688061302 x = -0.688061302 Simplifying x = -0.688061302

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.488061302, -0.688061302}

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