2x^2+15x+4=0

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Solution for 2x^2+15x+4=0 equation:


Simplifying
2x2 + 15x + 4 = 0

Reorder the terms:
4 + 15x + 2x2 = 0

Solving
4 + 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'.
2 + 7.5x + x2 = 0

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + 7.5x + -2 + x2 = 0 + -2

Reorder the terms:
2 + -2 + 7.5x + x2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + 7.5x + x2 = 0 + -2
7.5x + x2 = 0 + -2

Combine like terms: 0 + -2 = -2
7.5x + x2 = -2

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 = -2 + 14.0625

Reorder the terms:
14.0625 + 7.5x + x2 = -2 + 14.0625

Combine like terms: -2 + 14.0625 = 12.0625
14.0625 + 7.5x + x2 = 12.0625

Factor a perfect square on the left side:
(x + 3.75)(x + 3.75) = 12.0625

Calculate the square root of the right side: 3.473110997

Break this problem into two subproblems by setting 
(x + 3.75) equal to 3.473110997 and -3.473110997.

Subproblem 1

x + 3.75 = 3.473110997 Simplifying x + 3.75 = 3.473110997 Reorder the terms: 3.75 + x = 3.473110997 Solving 3.75 + x = 3.473110997 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 = 3.473110997 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + x = 3.473110997 + -3.75 x = 3.473110997 + -3.75 Combine like terms: 3.473110997 + -3.75 = -0.276889003 x = -0.276889003 Simplifying x = -0.276889003

Subproblem 2

x + 3.75 = -3.473110997 Simplifying x + 3.75 = -3.473110997 Reorder the terms: 3.75 + x = -3.473110997 Solving 3.75 + x = -3.473110997 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 = -3.473110997 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + x = -3.473110997 + -3.75 x = -3.473110997 + -3.75 Combine like terms: -3.473110997 + -3.75 = -7.223110997 x = -7.223110997 Simplifying x = -7.223110997

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.276889003, -7.223110997}

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