2x^2-11-42=-3x

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Solution for 2x^2-11-42=-3x equation:


Simplifying
2x2 + -11 + -42 = -3x

Reorder the terms:
-11 + -42 + 2x2 = -3x

Combine like terms: -11 + -42 = -53
-53 + 2x2 = -3x

Solving
-53 + 2x2 = -3x

Solving for variable 'x'.

Reorder the terms:
-53 + 3x + 2x2 = -3x + 3x

Combine like terms: -3x + 3x = 0
-53 + 3x + 2x2 = 0

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

Divide each side by '2'.
-26.5 + 1.5x + x2 = 0

Move the constant term to the right:

Add '26.5' to each side of the equation.
-26.5 + 1.5x + 26.5 + x2 = 0 + 26.5

Reorder the terms:
-26.5 + 26.5 + 1.5x + x2 = 0 + 26.5

Combine like terms: -26.5 + 26.5 = 0.0
0.0 + 1.5x + x2 = 0 + 26.5
1.5x + x2 = 0 + 26.5

Combine like terms: 0 + 26.5 = 26.5
1.5x + x2 = 26.5

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 = 26.5 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 26.5 + 0.5625

Combine like terms: 26.5 + 0.5625 = 27.0625
0.5625 + 1.5x + x2 = 27.0625

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 27.0625

Calculate the square root of the right side: 5.202163012

Break this problem into two subproblems by setting 
(x + 0.75) equal to 5.202163012 and -5.202163012.

Subproblem 1

x + 0.75 = 5.202163012 Simplifying x + 0.75 = 5.202163012 Reorder the terms: 0.75 + x = 5.202163012 Solving 0.75 + x = 5.202163012 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 = 5.202163012 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 5.202163012 + -0.75 x = 5.202163012 + -0.75 Combine like terms: 5.202163012 + -0.75 = 4.452163012 x = 4.452163012 Simplifying x = 4.452163012

Subproblem 2

x + 0.75 = -5.202163012 Simplifying x + 0.75 = -5.202163012 Reorder the terms: 0.75 + x = -5.202163012 Solving 0.75 + x = -5.202163012 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 = -5.202163012 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -5.202163012 + -0.75 x = -5.202163012 + -0.75 Combine like terms: -5.202163012 + -0.75 = -5.952163012 x = -5.952163012 Simplifying x = -5.952163012

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.452163012, -5.952163012}

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