(5x-4)(5x-4)=60

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Solution for (5x-4)(5x-4)=60 equation:


Simplifying
(5x + -4)(5x + -4) = 60

Reorder the terms:
(-4 + 5x)(5x + -4) = 60

Reorder the terms:
(-4 + 5x)(-4 + 5x) = 60

Multiply (-4 + 5x) * (-4 + 5x)
(-4(-4 + 5x) + 5x * (-4 + 5x)) = 60
((-4 * -4 + 5x * -4) + 5x * (-4 + 5x)) = 60
((16 + -20x) + 5x * (-4 + 5x)) = 60
(16 + -20x + (-4 * 5x + 5x * 5x)) = 60
(16 + -20x + (-20x + 25x2)) = 60

Combine like terms: -20x + -20x = -40x
(16 + -40x + 25x2) = 60

Solving
16 + -40x + 25x2 = 60

Solving for variable 'x'.

Reorder the terms:
16 + -60 + -40x + 25x2 = 60 + -60

Combine like terms: 16 + -60 = -44
-44 + -40x + 25x2 = 60 + -60

Combine like terms: 60 + -60 = 0
-44 + -40x + 25x2 = 0

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

Divide each side by '25'.
-1.76 + -1.6x + x2 = 0

Move the constant term to the right:

Add '1.76' to each side of the equation.
-1.76 + -1.6x + 1.76 + x2 = 0 + 1.76

Reorder the terms:
-1.76 + 1.76 + -1.6x + x2 = 0 + 1.76

Combine like terms: -1.76 + 1.76 = 0.00
0.00 + -1.6x + x2 = 0 + 1.76
-1.6x + x2 = 0 + 1.76

Combine like terms: 0 + 1.76 = 1.76
-1.6x + x2 = 1.76

The x term is -1.6x.  Take half its coefficient (-0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
-1.6x + 0.64 + x2 = 1.76 + 0.64

Reorder the terms:
0.64 + -1.6x + x2 = 1.76 + 0.64

Combine like terms: 1.76 + 0.64 = 2.4
0.64 + -1.6x + x2 = 2.4

Factor a perfect square on the left side:
(x + -0.8)(x + -0.8) = 2.4

Calculate the square root of the right side: 1.549193338

Break this problem into two subproblems by setting 
(x + -0.8) equal to 1.549193338 and -1.549193338.

Subproblem 1

x + -0.8 = 1.549193338 Simplifying x + -0.8 = 1.549193338 Reorder the terms: -0.8 + x = 1.549193338 Solving -0.8 + x = 1.549193338 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + x = 1.549193338 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + x = 1.549193338 + 0.8 x = 1.549193338 + 0.8 Combine like terms: 1.549193338 + 0.8 = 2.349193338 x = 2.349193338 Simplifying x = 2.349193338

Subproblem 2

x + -0.8 = -1.549193338 Simplifying x + -0.8 = -1.549193338 Reorder the terms: -0.8 + x = -1.549193338 Solving -0.8 + x = -1.549193338 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + x = -1.549193338 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + x = -1.549193338 + 0.8 x = -1.549193338 + 0.8 Combine like terms: -1.549193338 + 0.8 = -0.749193338 x = -0.749193338 Simplifying x = -0.749193338

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.349193338, -0.749193338}

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