6x^2+14x-15=0

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Solution for 6x^2+14x-15=0 equation:


Simplifying
6x2 + 14x + -15 = 0

Reorder the terms:
-15 + 14x + 6x2 = 0

Solving
-15 + 14x + 6x2 = 0

Solving for variable 'x'.

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

Divide each side by '6'.
-2.5 + 2.333333333x + x2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + 2.333333333x + 2.5 + x2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + 2.333333333x + x2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + 2.333333333x + x2 = 0 + 2.5
2.333333333x + x2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
2.333333333x + x2 = 2.5

The x term is 2.333333333x.  Take half its coefficient (1.166666667).
Square it (1.361111112) and add it to both sides.

Add '1.361111112' to each side of the equation.
2.333333333x + 1.361111112 + x2 = 2.5 + 1.361111112

Reorder the terms:
1.361111112 + 2.333333333x + x2 = 2.5 + 1.361111112

Combine like terms: 2.5 + 1.361111112 = 3.861111112
1.361111112 + 2.333333333x + x2 = 3.861111112

Factor a perfect square on the left side:
(x + 1.166666667)(x + 1.166666667) = 3.861111112

Calculate the square root of the right side: 1.964971021

Break this problem into two subproblems by setting 
(x + 1.166666667) equal to 1.964971021 and -1.964971021.

Subproblem 1

x + 1.166666667 = 1.964971021 Simplifying x + 1.166666667 = 1.964971021 Reorder the terms: 1.166666667 + x = 1.964971021 Solving 1.166666667 + x = 1.964971021 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.166666667' to each side of the equation. 1.166666667 + -1.166666667 + x = 1.964971021 + -1.166666667 Combine like terms: 1.166666667 + -1.166666667 = 0.000000000 0.000000000 + x = 1.964971021 + -1.166666667 x = 1.964971021 + -1.166666667 Combine like terms: 1.964971021 + -1.166666667 = 0.798304354 x = 0.798304354 Simplifying x = 0.798304354

Subproblem 2

x + 1.166666667 = -1.964971021 Simplifying x + 1.166666667 = -1.964971021 Reorder the terms: 1.166666667 + x = -1.964971021 Solving 1.166666667 + x = -1.964971021 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.166666667' to each side of the equation. 1.166666667 + -1.166666667 + x = -1.964971021 + -1.166666667 Combine like terms: 1.166666667 + -1.166666667 = 0.000000000 0.000000000 + x = -1.964971021 + -1.166666667 x = -1.964971021 + -1.166666667 Combine like terms: -1.964971021 + -1.166666667 = -3.131637688 x = -3.131637688 Simplifying x = -3.131637688

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.798304354, -3.131637688}

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