x^2=3x+11

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Solution for x^2=3x+11 equation:


Simplifying
x2 = 3x + 11

Reorder the terms:
x2 = 11 + 3x

Solving
x2 = 11 + 3x

Solving for variable 'x'.

Reorder the terms:
-11 + -3x + x2 = 11 + 3x + -11 + -3x

Reorder the terms:
-11 + -3x + x2 = 11 + -11 + 3x + -3x

Combine like terms: 11 + -11 = 0
-11 + -3x + x2 = 0 + 3x + -3x
-11 + -3x + x2 = 3x + -3x

Combine like terms: 3x + -3x = 0
-11 + -3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '11' to each side of the equation.
-11 + -3x + 11 + x2 = 0 + 11

Reorder the terms:
-11 + 11 + -3x + x2 = 0 + 11

Combine like terms: -11 + 11 = 0
0 + -3x + x2 = 0 + 11
-3x + x2 = 0 + 11

Combine like terms: 0 + 11 = 11
-3x + x2 = 11

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 11 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 11 + 2.25

Combine like terms: 11 + 2.25 = 13.25
2.25 + -3x + x2 = 13.25

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 13.25

Calculate the square root of the right side: 3.640054945

Break this problem into two subproblems by setting 
(x + -1.5) equal to 3.640054945 and -3.640054945.

Subproblem 1

x + -1.5 = 3.640054945 Simplifying x + -1.5 = 3.640054945 Reorder the terms: -1.5 + x = 3.640054945 Solving -1.5 + x = 3.640054945 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 3.640054945 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 3.640054945 + 1.5 x = 3.640054945 + 1.5 Combine like terms: 3.640054945 + 1.5 = 5.140054945 x = 5.140054945 Simplifying x = 5.140054945

Subproblem 2

x + -1.5 = -3.640054945 Simplifying x + -1.5 = -3.640054945 Reorder the terms: -1.5 + x = -3.640054945 Solving -1.5 + x = -3.640054945 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -3.640054945 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -3.640054945 + 1.5 x = -3.640054945 + 1.5 Combine like terms: -3.640054945 + 1.5 = -2.140054945 x = -2.140054945 Simplifying x = -2.140054945

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.140054945, -2.140054945}

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