5x^2+11x=20

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Solution for 5x^2+11x=20 equation:


Simplifying
5x2 + 11x = 20

Reorder the terms:
11x + 5x2 = 20

Solving
11x + 5x2 = 20

Solving for variable 'x'.

Reorder the terms:
-20 + 11x + 5x2 = 20 + -20

Combine like terms: 20 + -20 = 0
-20 + 11x + 5x2 = 0

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

Divide each side by '5'.
-4 + 2.2x + x2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + 2.2x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + 2.2x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 2.2x + x2 = 0 + 4
2.2x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
2.2x + x2 = 4

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 = 4 + 1.21

Reorder the terms:
1.21 + 2.2x + x2 = 4 + 1.21

Combine like terms: 4 + 1.21 = 5.21
1.21 + 2.2x + x2 = 5.21

Factor a perfect square on the left side:
(x + 1.1)(x + 1.1) = 5.21

Calculate the square root of the right side: 2.282542442

Break this problem into two subproblems by setting 
(x + 1.1) equal to 2.282542442 and -2.282542442.

Subproblem 1

x + 1.1 = 2.282542442 Simplifying x + 1.1 = 2.282542442 Reorder the terms: 1.1 + x = 2.282542442 Solving 1.1 + x = 2.282542442 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 = 2.282542442 + -1.1 Combine like terms: 1.1 + -1.1 = 0.0 0.0 + x = 2.282542442 + -1.1 x = 2.282542442 + -1.1 Combine like terms: 2.282542442 + -1.1 = 1.182542442 x = 1.182542442 Simplifying x = 1.182542442

Subproblem 2

x + 1.1 = -2.282542442 Simplifying x + 1.1 = -2.282542442 Reorder the terms: 1.1 + x = -2.282542442 Solving 1.1 + x = -2.282542442 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 = -2.282542442 + -1.1 Combine like terms: 1.1 + -1.1 = 0.0 0.0 + x = -2.282542442 + -1.1 x = -2.282542442 + -1.1 Combine like terms: -2.282542442 + -1.1 = -3.382542442 x = -3.382542442 Simplifying x = -3.382542442

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.182542442, -3.382542442}

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