2x^2+19x+28=0

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Solution for 2x^2+19x+28=0 equation:


Simplifying
2x2 + 19x + 28 = 0

Reorder the terms:
28 + 19x + 2x2 = 0

Solving
28 + 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'.
14 + 9.5x + x2 = 0

Move the constant term to the right:

Add '-14' to each side of the equation.
14 + 9.5x + -14 + x2 = 0 + -14

Reorder the terms:
14 + -14 + 9.5x + x2 = 0 + -14

Combine like terms: 14 + -14 = 0
0 + 9.5x + x2 = 0 + -14
9.5x + x2 = 0 + -14

Combine like terms: 0 + -14 = -14
9.5x + x2 = -14

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 = -14 + 22.5625

Reorder the terms:
22.5625 + 9.5x + x2 = -14 + 22.5625

Combine like terms: -14 + 22.5625 = 8.5625
22.5625 + 9.5x + x2 = 8.5625

Factor a perfect square on the left side:
(x + 4.75)(x + 4.75) = 8.5625

Calculate the square root of the right side: 2.926174978

Break this problem into two subproblems by setting 
(x + 4.75) equal to 2.926174978 and -2.926174978.

Subproblem 1

x + 4.75 = 2.926174978 Simplifying x + 4.75 = 2.926174978 Reorder the terms: 4.75 + x = 2.926174978 Solving 4.75 + x = 2.926174978 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 = 2.926174978 + -4.75 Combine like terms: 4.75 + -4.75 = 0.00 0.00 + x = 2.926174978 + -4.75 x = 2.926174978 + -4.75 Combine like terms: 2.926174978 + -4.75 = -1.823825022 x = -1.823825022 Simplifying x = -1.823825022

Subproblem 2

x + 4.75 = -2.926174978 Simplifying x + 4.75 = -2.926174978 Reorder the terms: 4.75 + x = -2.926174978 Solving 4.75 + x = -2.926174978 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 = -2.926174978 + -4.75 Combine like terms: 4.75 + -4.75 = 0.00 0.00 + x = -2.926174978 + -4.75 x = -2.926174978 + -4.75 Combine like terms: -2.926174978 + -4.75 = -7.676174978 x = -7.676174978 Simplifying x = -7.676174978

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.823825022, -7.676174978}

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