4x^2+11x=9x+19

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Solution for 4x^2+11x=9x+19 equation:


Simplifying
4x2 + 11x = 9x + 19

Reorder the terms:
11x + 4x2 = 9x + 19

Reorder the terms:
11x + 4x2 = 19 + 9x

Solving
11x + 4x2 = 19 + 9x

Solving for variable 'x'.

Reorder the terms:
-19 + 11x + -9x + 4x2 = 19 + 9x + -19 + -9x

Combine like terms: 11x + -9x = 2x
-19 + 2x + 4x2 = 19 + 9x + -19 + -9x

Reorder the terms:
-19 + 2x + 4x2 = 19 + -19 + 9x + -9x

Combine like terms: 19 + -19 = 0
-19 + 2x + 4x2 = 0 + 9x + -9x
-19 + 2x + 4x2 = 9x + -9x

Combine like terms: 9x + -9x = 0
-19 + 2x + 4x2 = 0

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

Divide each side by '4'.
-4.75 + 0.5x + x2 = 0

Move the constant term to the right:

Add '4.75' to each side of the equation.
-4.75 + 0.5x + 4.75 + x2 = 0 + 4.75

Reorder the terms:
-4.75 + 4.75 + 0.5x + x2 = 0 + 4.75

Combine like terms: -4.75 + 4.75 = 0.00
0.00 + 0.5x + x2 = 0 + 4.75
0.5x + x2 = 0 + 4.75

Combine like terms: 0 + 4.75 = 4.75
0.5x + x2 = 4.75

The x term is 0.5x.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5x + 0.0625 + x2 = 4.75 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = 4.75 + 0.0625

Combine like terms: 4.75 + 0.0625 = 4.8125
0.0625 + 0.5x + x2 = 4.8125

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 4.8125

Calculate the square root of the right side: 2.193741097

Break this problem into two subproblems by setting 
(x + 0.25) equal to 2.193741097 and -2.193741097.

Subproblem 1

x + 0.25 = 2.193741097 Simplifying x + 0.25 = 2.193741097 Reorder the terms: 0.25 + x = 2.193741097 Solving 0.25 + x = 2.193741097 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = 2.193741097 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 2.193741097 + -0.25 x = 2.193741097 + -0.25 Combine like terms: 2.193741097 + -0.25 = 1.943741097 x = 1.943741097 Simplifying x = 1.943741097

Subproblem 2

x + 0.25 = -2.193741097 Simplifying x + 0.25 = -2.193741097 Reorder the terms: 0.25 + x = -2.193741097 Solving 0.25 + x = -2.193741097 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = -2.193741097 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = -2.193741097 + -0.25 x = -2.193741097 + -0.25 Combine like terms: -2.193741097 + -0.25 = -2.443741097 x = -2.443741097 Simplifying x = -2.443741097

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.943741097, -2.443741097}

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