2x^2+19x-4=0

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Solution for 2x^2+19x-4=0 equation:


Simplifying
2x2 + 19x + -4 = 0

Reorder the terms:
-4 + 19x + 2x2 = 0

Solving
-4 + 19x + 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 + 9.5x + x2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + 9.5x + 2 + x2 = 0 + 2

Reorder the terms:
-2 + 2 + 9.5x + x2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + 9.5x + x2 = 0 + 2
9.5x + x2 = 0 + 2

Combine like terms: 0 + 2 = 2
9.5x + x2 = 2

The x term is 9.5x.  Take half its coefficient (4.75).
Square it (22.5625) and add it to both sides.

Add '22.5625' to each side of the equation.
9.5x + 22.5625 + x2 = 2 + 22.5625

Reorder the terms:
22.5625 + 9.5x + x2 = 2 + 22.5625

Combine like terms: 2 + 22.5625 = 24.5625
22.5625 + 9.5x + x2 = 24.5625

Factor a perfect square on the left side:
(x + 4.75)(x + 4.75) = 24.5625

Calculate the square root of the right side: 4.9560569

Break this problem into two subproblems by setting 
(x + 4.75) equal to 4.9560569 and -4.9560569.

Subproblem 1

x + 4.75 = 4.9560569 Simplifying x + 4.75 = 4.9560569 Reorder the terms: 4.75 + x = 4.9560569 Solving 4.75 + x = 4.9560569 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.75' to each side of the equation. 4.75 + -4.75 + x = 4.9560569 + -4.75 Combine like terms: 4.75 + -4.75 = 0.00 0.00 + x = 4.9560569 + -4.75 x = 4.9560569 + -4.75 Combine like terms: 4.9560569 + -4.75 = 0.2060569 x = 0.2060569 Simplifying x = 0.2060569

Subproblem 2

x + 4.75 = -4.9560569 Simplifying x + 4.75 = -4.9560569 Reorder the terms: 4.75 + x = -4.9560569 Solving 4.75 + x = -4.9560569 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.75' to each side of the equation. 4.75 + -4.75 + x = -4.9560569 + -4.75 Combine like terms: 4.75 + -4.75 = 0.00 0.00 + x = -4.9560569 + -4.75 x = -4.9560569 + -4.75 Combine like terms: -4.9560569 + -4.75 = -9.7060569 x = -9.7060569 Simplifying x = -9.7060569

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.2060569, -9.7060569}

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