3x^2-2x-11=x^2-5x

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Solution for 3x^2-2x-11=x^2-5x equation:


Simplifying
3x2 + -2x + -11 = x2 + -5x

Reorder the terms:
-11 + -2x + 3x2 = x2 + -5x

Reorder the terms:
-11 + -2x + 3x2 = -5x + x2

Solving
-11 + -2x + 3x2 = -5x + x2

Solving for variable 'x'.

Reorder the terms:
-11 + -2x + 5x + 3x2 + -1x2 = -5x + x2 + 5x + -1x2

Combine like terms: -2x + 5x = 3x
-11 + 3x + 3x2 + -1x2 = -5x + x2 + 5x + -1x2

Combine like terms: 3x2 + -1x2 = 2x2
-11 + 3x + 2x2 = -5x + x2 + 5x + -1x2

Reorder the terms:
-11 + 3x + 2x2 = -5x + 5x + x2 + -1x2

Combine like terms: -5x + 5x = 0
-11 + 3x + 2x2 = 0 + x2 + -1x2
-11 + 3x + 2x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-11 + 3x + 2x2 = 0

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

Divide each side by '2'.
-5.5 + 1.5x + x2 = 0

Move the constant term to the right:

Add '5.5' to each side of the equation.
-5.5 + 1.5x + 5.5 + x2 = 0 + 5.5

Reorder the terms:
-5.5 + 5.5 + 1.5x + x2 = 0 + 5.5

Combine like terms: -5.5 + 5.5 = 0.0
0.0 + 1.5x + x2 = 0 + 5.5
1.5x + x2 = 0 + 5.5

Combine like terms: 0 + 5.5 = 5.5
1.5x + x2 = 5.5

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = 5.5 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 5.5 + 0.5625

Combine like terms: 5.5 + 0.5625 = 6.0625
0.5625 + 1.5x + x2 = 6.0625

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 6.0625

Calculate the square root of the right side: 2.46221445

Break this problem into two subproblems by setting 
(x + 0.75) equal to 2.46221445 and -2.46221445.

Subproblem 1

x + 0.75 = 2.46221445 Simplifying x + 0.75 = 2.46221445 Reorder the terms: 0.75 + x = 2.46221445 Solving 0.75 + x = 2.46221445 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 2.46221445 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 2.46221445 + -0.75 x = 2.46221445 + -0.75 Combine like terms: 2.46221445 + -0.75 = 1.71221445 x = 1.71221445 Simplifying x = 1.71221445

Subproblem 2

x + 0.75 = -2.46221445 Simplifying x + 0.75 = -2.46221445 Reorder the terms: 0.75 + x = -2.46221445 Solving 0.75 + x = -2.46221445 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -2.46221445 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -2.46221445 + -0.75 x = -2.46221445 + -0.75 Combine like terms: -2.46221445 + -0.75 = -3.21221445 x = -3.21221445 Simplifying x = -3.21221445

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.71221445, -3.21221445}

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