5x(x-4)-4(x-5)=

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Solution for 5x(x-4)-4(x-5)= equation:


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

Reorder the terms:
5x(-4 + x) + -4(x + -5) = 0
(-4 * 5x + x * 5x) + -4(x + -5) = 0
(-20x + 5x2) + -4(x + -5) = 0

Reorder the terms:
-20x + 5x2 + -4(-5 + x) = 0
-20x + 5x2 + (-5 * -4 + x * -4) = 0
-20x + 5x2 + (20 + -4x) = 0

Reorder the terms:
20 + -20x + -4x + 5x2 = 0

Combine like terms: -20x + -4x = -24x
20 + -24x + 5x2 = 0

Solving
20 + -24x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
4 + -4.8x + x2 = 0

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + -4.8x + -4 + x2 = 0 + -4

Reorder the terms:
4 + -4 + -4.8x + x2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -4.8x + x2 = 0 + -4
-4.8x + x2 = 0 + -4

Combine like terms: 0 + -4 = -4
-4.8x + x2 = -4

The x term is -4.8x.  Take half its coefficient (-2.4).
Square it (5.76) and add it to both sides.

Add '5.76' to each side of the equation.
-4.8x + 5.76 + x2 = -4 + 5.76

Reorder the terms:
5.76 + -4.8x + x2 = -4 + 5.76

Combine like terms: -4 + 5.76 = 1.76
5.76 + -4.8x + x2 = 1.76

Factor a perfect square on the left side:
(x + -2.4)(x + -2.4) = 1.76

Calculate the square root of the right side: 1.326649916

Break this problem into two subproblems by setting 
(x + -2.4) equal to 1.326649916 and -1.326649916.

Subproblem 1

x + -2.4 = 1.326649916 Simplifying x + -2.4 = 1.326649916 Reorder the terms: -2.4 + x = 1.326649916 Solving -2.4 + x = 1.326649916 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.4' to each side of the equation. -2.4 + 2.4 + x = 1.326649916 + 2.4 Combine like terms: -2.4 + 2.4 = 0.0 0.0 + x = 1.326649916 + 2.4 x = 1.326649916 + 2.4 Combine like terms: 1.326649916 + 2.4 = 3.726649916 x = 3.726649916 Simplifying x = 3.726649916

Subproblem 2

x + -2.4 = -1.326649916 Simplifying x + -2.4 = -1.326649916 Reorder the terms: -2.4 + x = -1.326649916 Solving -2.4 + x = -1.326649916 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.4' to each side of the equation. -2.4 + 2.4 + x = -1.326649916 + 2.4 Combine like terms: -2.4 + 2.4 = 0.0 0.0 + x = -1.326649916 + 2.4 x = -1.326649916 + 2.4 Combine like terms: -1.326649916 + 2.4 = 1.073350084 x = 1.073350084 Simplifying x = 1.073350084

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.726649916, 1.073350084}

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