4x^2-5x-6=11

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Solution for 4x^2-5x-6=11 equation:


Simplifying
4x2 + -5x + -6 = 11

Reorder the terms:
-6 + -5x + 4x2 = 11

Solving
-6 + -5x + 4x2 = 11

Solving for variable 'x'.

Reorder the terms:
-6 + -11 + -5x + 4x2 = 11 + -11

Combine like terms: -6 + -11 = -17
-17 + -5x + 4x2 = 11 + -11

Combine like terms: 11 + -11 = 0
-17 + -5x + 4x2 = 0

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

Divide each side by '4'.
-4.25 + -1.25x + x2 = 0

Move the constant term to the right:

Add '4.25' to each side of the equation.
-4.25 + -1.25x + 4.25 + x2 = 0 + 4.25

Reorder the terms:
-4.25 + 4.25 + -1.25x + x2 = 0 + 4.25

Combine like terms: -4.25 + 4.25 = 0.00
0.00 + -1.25x + x2 = 0 + 4.25
-1.25x + x2 = 0 + 4.25

Combine like terms: 0 + 4.25 = 4.25
-1.25x + x2 = 4.25

The x term is -1.25x.  Take half its coefficient (-0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
-1.25x + 0.390625 + x2 = 4.25 + 0.390625

Reorder the terms:
0.390625 + -1.25x + x2 = 4.25 + 0.390625

Combine like terms: 4.25 + 0.390625 = 4.640625
0.390625 + -1.25x + x2 = 4.640625

Factor a perfect square on the left side:
(x + -0.625)(x + -0.625) = 4.640625

Calculate the square root of the right side: 2.154210992

Break this problem into two subproblems by setting 
(x + -0.625) equal to 2.154210992 and -2.154210992.

Subproblem 1

x + -0.625 = 2.154210992 Simplifying x + -0.625 = 2.154210992 Reorder the terms: -0.625 + x = 2.154210992 Solving -0.625 + x = 2.154210992 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + x = 2.154210992 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = 2.154210992 + 0.625 x = 2.154210992 + 0.625 Combine like terms: 2.154210992 + 0.625 = 2.779210992 x = 2.779210992 Simplifying x = 2.779210992

Subproblem 2

x + -0.625 = -2.154210992 Simplifying x + -0.625 = -2.154210992 Reorder the terms: -0.625 + x = -2.154210992 Solving -0.625 + x = -2.154210992 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + x = -2.154210992 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = -2.154210992 + 0.625 x = -2.154210992 + 0.625 Combine like terms: -2.154210992 + 0.625 = -1.529210992 x = -1.529210992 Simplifying x = -1.529210992

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.779210992, -1.529210992}

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