3(x+5)(x-5)-4(x-2)=

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Solution for 3(x+5)(x-5)-4(x-2)= equation:


Simplifying
3(x + 5)(x + -5) + -4(x + -2) = 0

Reorder the terms:
3(5 + x)(x + -5) + -4(x + -2) = 0

Reorder the terms:
3(5 + x)(-5 + x) + -4(x + -2) = 0

Multiply (5 + x) * (-5 + x)
3(5(-5 + x) + x(-5 + x)) + -4(x + -2) = 0
3((-5 * 5 + x * 5) + x(-5 + x)) + -4(x + -2) = 0
3((-25 + 5x) + x(-5 + x)) + -4(x + -2) = 0
3(-25 + 5x + (-5 * x + x * x)) + -4(x + -2) = 0
3(-25 + 5x + (-5x + x2)) + -4(x + -2) = 0

Combine like terms: 5x + -5x = 0
3(-25 + 0 + x2) + -4(x + -2) = 0
3(-25 + x2) + -4(x + -2) = 0
(-25 * 3 + x2 * 3) + -4(x + -2) = 0
(-75 + 3x2) + -4(x + -2) = 0

Reorder the terms:
-75 + 3x2 + -4(-2 + x) = 0
-75 + 3x2 + (-2 * -4 + x * -4) = 0
-75 + 3x2 + (8 + -4x) = 0

Reorder the terms:
-75 + 8 + -4x + 3x2 = 0

Combine like terms: -75 + 8 = -67
-67 + -4x + 3x2 = 0

Solving
-67 + -4x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
-22.33333333 + -1.333333333x + x2 = 0

Move the constant term to the right:

Add '22.33333333' to each side of the equation.
-22.33333333 + -1.333333333x + 22.33333333 + x2 = 0 + 22.33333333

Reorder the terms:
-22.33333333 + 22.33333333 + -1.333333333x + x2 = 0 + 22.33333333

Combine like terms: -22.33333333 + 22.33333333 = 0.00000000
0.00000000 + -1.333333333x + x2 = 0 + 22.33333333
-1.333333333x + x2 = 0 + 22.33333333

Combine like terms: 0 + 22.33333333 = 22.33333333
-1.333333333x + x2 = 22.33333333

The x term is -1.333333333x.  Take half its coefficient (-0.6666666665).
Square it (0.4444444442) and add it to both sides.

Add '0.4444444442' to each side of the equation.
-1.333333333x + 0.4444444442 + x2 = 22.33333333 + 0.4444444442

Reorder the terms:
0.4444444442 + -1.333333333x + x2 = 22.33333333 + 0.4444444442

Combine like terms: 22.33333333 + 0.4444444442 = 22.7777777742
0.4444444442 + -1.333333333x + x2 = 22.7777777742

Factor a perfect square on the left side:
(x + -0.6666666665)(x + -0.6666666665) = 22.7777777742

Calculate the square root of the right side: 4.772607021

Break this problem into two subproblems by setting 
(x + -0.6666666665) equal to 4.772607021 and -4.772607021.

Subproblem 1

x + -0.6666666665 = 4.772607021 Simplifying x + -0.6666666665 = 4.772607021 Reorder the terms: -0.6666666665 + x = 4.772607021 Solving -0.6666666665 + x = 4.772607021 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6666666665' to each side of the equation. -0.6666666665 + 0.6666666665 + x = 4.772607021 + 0.6666666665 Combine like terms: -0.6666666665 + 0.6666666665 = 0.0000000000 0.0000000000 + x = 4.772607021 + 0.6666666665 x = 4.772607021 + 0.6666666665 Combine like terms: 4.772607021 + 0.6666666665 = 5.4392736875 x = 5.4392736875 Simplifying x = 5.4392736875

Subproblem 2

x + -0.6666666665 = -4.772607021 Simplifying x + -0.6666666665 = -4.772607021 Reorder the terms: -0.6666666665 + x = -4.772607021 Solving -0.6666666665 + x = -4.772607021 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6666666665' to each side of the equation. -0.6666666665 + 0.6666666665 + x = -4.772607021 + 0.6666666665 Combine like terms: -0.6666666665 + 0.6666666665 = 0.0000000000 0.0000000000 + x = -4.772607021 + 0.6666666665 x = -4.772607021 + 0.6666666665 Combine like terms: -4.772607021 + 0.6666666665 = -4.1059403545 x = -4.1059403545 Simplifying x = -4.1059403545

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.4392736875, -4.1059403545}

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