5x^2+11x-28=0

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Solution for 5x^2+11x-28=0 equation:


Simplifying
5x2 + 11x + -28 = 0

Reorder the terms:
-28 + 11x + 5x2 = 0

Solving
-28 + 11x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-5.6 + 2.2x + x2 = 0

Move the constant term to the right:

Add '5.6' to each side of the equation.
-5.6 + 2.2x + 5.6 + x2 = 0 + 5.6

Reorder the terms:
-5.6 + 5.6 + 2.2x + x2 = 0 + 5.6

Combine like terms: -5.6 + 5.6 = 0.0
0.0 + 2.2x + x2 = 0 + 5.6
2.2x + x2 = 0 + 5.6

Combine like terms: 0 + 5.6 = 5.6
2.2x + x2 = 5.6

The x term is 2.2x.  Take half its coefficient (1.1).
Square it (1.21) and add it to both sides.

Add '1.21' to each side of the equation.
2.2x + 1.21 + x2 = 5.6 + 1.21

Reorder the terms:
1.21 + 2.2x + x2 = 5.6 + 1.21

Combine like terms: 5.6 + 1.21 = 6.81
1.21 + 2.2x + x2 = 6.81

Factor a perfect square on the left side:
(x + 1.1)(x + 1.1) = 6.81

Calculate the square root of the right side: 2.60959767

Break this problem into two subproblems by setting 
(x + 1.1) equal to 2.60959767 and -2.60959767.

Subproblem 1

x + 1.1 = 2.60959767 Simplifying x + 1.1 = 2.60959767 Reorder the terms: 1.1 + x = 2.60959767 Solving 1.1 + x = 2.60959767 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.1' to each side of the equation. 1.1 + -1.1 + x = 2.60959767 + -1.1 Combine like terms: 1.1 + -1.1 = 0.0 0.0 + x = 2.60959767 + -1.1 x = 2.60959767 + -1.1 Combine like terms: 2.60959767 + -1.1 = 1.50959767 x = 1.50959767 Simplifying x = 1.50959767

Subproblem 2

x + 1.1 = -2.60959767 Simplifying x + 1.1 = -2.60959767 Reorder the terms: 1.1 + x = -2.60959767 Solving 1.1 + x = -2.60959767 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.1' to each side of the equation. 1.1 + -1.1 + x = -2.60959767 + -1.1 Combine like terms: 1.1 + -1.1 = 0.0 0.0 + x = -2.60959767 + -1.1 x = -2.60959767 + -1.1 Combine like terms: -2.60959767 + -1.1 = -3.70959767 x = -3.70959767 Simplifying x = -3.70959767

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.50959767, -3.70959767}

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