2x^2+15x+14=0

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


Simplifying
2x2 + 15x + 14 = 0

Reorder the terms:
14 + 15x + 2x2 = 0

Solving
14 + 15x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
7 + 7.5x + x2 = 0

Move the constant term to the right:

Add '-7' to each side of the equation.
7 + 7.5x + -7 + x2 = 0 + -7

Reorder the terms:
7 + -7 + 7.5x + x2 = 0 + -7

Combine like terms: 7 + -7 = 0
0 + 7.5x + x2 = 0 + -7
7.5x + x2 = 0 + -7

Combine like terms: 0 + -7 = -7
7.5x + x2 = -7

The x term is 7.5x.  Take half its coefficient (3.75).
Square it (14.0625) and add it to both sides.

Add '14.0625' to each side of the equation.
7.5x + 14.0625 + x2 = -7 + 14.0625

Reorder the terms:
14.0625 + 7.5x + x2 = -7 + 14.0625

Combine like terms: -7 + 14.0625 = 7.0625
14.0625 + 7.5x + x2 = 7.0625

Factor a perfect square on the left side:
(x + 3.75)(x + 3.75) = 7.0625

Calculate the square root of the right side: 2.657536453

Break this problem into two subproblems by setting 
(x + 3.75) equal to 2.657536453 and -2.657536453.

Subproblem 1

x + 3.75 = 2.657536453 Simplifying x + 3.75 = 2.657536453 Reorder the terms: 3.75 + x = 2.657536453 Solving 3.75 + x = 2.657536453 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.75' to each side of the equation. 3.75 + -3.75 + x = 2.657536453 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + x = 2.657536453 + -3.75 x = 2.657536453 + -3.75 Combine like terms: 2.657536453 + -3.75 = -1.092463547 x = -1.092463547 Simplifying x = -1.092463547

Subproblem 2

x + 3.75 = -2.657536453 Simplifying x + 3.75 = -2.657536453 Reorder the terms: 3.75 + x = -2.657536453 Solving 3.75 + x = -2.657536453 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.75' to each side of the equation. 3.75 + -3.75 + x = -2.657536453 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + x = -2.657536453 + -3.75 x = -2.657536453 + -3.75 Combine like terms: -2.657536453 + -3.75 = -6.407536453 x = -6.407536453 Simplifying x = -6.407536453

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.092463547, -6.407536453}

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