(2x-11)(2x+5)=64

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Solution for (2x-11)(2x+5)=64 equation:


Simplifying
(2x + -11)(2x + 5) = 64

Reorder the terms:
(-11 + 2x)(2x + 5) = 64

Reorder the terms:
(-11 + 2x)(5 + 2x) = 64

Multiply (-11 + 2x) * (5 + 2x)
(-11(5 + 2x) + 2x * (5 + 2x)) = 64
((5 * -11 + 2x * -11) + 2x * (5 + 2x)) = 64
((-55 + -22x) + 2x * (5 + 2x)) = 64
(-55 + -22x + (5 * 2x + 2x * 2x)) = 64
(-55 + -22x + (10x + 4x2)) = 64

Combine like terms: -22x + 10x = -12x
(-55 + -12x + 4x2) = 64

Solving
-55 + -12x + 4x2 = 64

Solving for variable 'x'.

Reorder the terms:
-55 + -64 + -12x + 4x2 = 64 + -64

Combine like terms: -55 + -64 = -119
-119 + -12x + 4x2 = 64 + -64

Combine like terms: 64 + -64 = 0
-119 + -12x + 4x2 = 0

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

Divide each side by '4'.
-29.75 + -3x + x2 = 0

Move the constant term to the right:

Add '29.75' to each side of the equation.
-29.75 + -3x + 29.75 + x2 = 0 + 29.75

Reorder the terms:
-29.75 + 29.75 + -3x + x2 = 0 + 29.75

Combine like terms: -29.75 + 29.75 = 0.00
0.00 + -3x + x2 = 0 + 29.75
-3x + x2 = 0 + 29.75

Combine like terms: 0 + 29.75 = 29.75
-3x + x2 = 29.75

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 = 29.75 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 29.75 + 2.25

Combine like terms: 29.75 + 2.25 = 32
2.25 + -3x + x2 = 32

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 32

Calculate the square root of the right side: 5.656854249

Break this problem into two subproblems by setting 
(x + -1.5) equal to 5.656854249 and -5.656854249.

Subproblem 1

x + -1.5 = 5.656854249 Simplifying x + -1.5 = 5.656854249 Reorder the terms: -1.5 + x = 5.656854249 Solving -1.5 + x = 5.656854249 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 = 5.656854249 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 5.656854249 + 1.5 x = 5.656854249 + 1.5 Combine like terms: 5.656854249 + 1.5 = 7.156854249 x = 7.156854249 Simplifying x = 7.156854249

Subproblem 2

x + -1.5 = -5.656854249 Simplifying x + -1.5 = -5.656854249 Reorder the terms: -1.5 + x = -5.656854249 Solving -1.5 + x = -5.656854249 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 = -5.656854249 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -5.656854249 + 1.5 x = -5.656854249 + 1.5 Combine like terms: -5.656854249 + 1.5 = -4.156854249 x = -4.156854249 Simplifying x = -4.156854249

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.156854249, -4.156854249}

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