8x(5x-4)=5

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Solution for 8x(5x-4)=5 equation:


Simplifying
8x(5x + -4) = 5

Reorder the terms:
8x(-4 + 5x) = 5
(-4 * 8x + 5x * 8x) = 5
(-32x + 40x2) = 5

Solving
-32x + 40x2 = 5

Solving for variable 'x'.

Reorder the terms:
-5 + -32x + 40x2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + -32x + 40x2 = 0

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

Divide each side by '40'.
-0.125 + -0.8x + x2 = 0.0

Move the constant term to the right:

Add '0.125' to each side of the equation.
-0.125 + -0.8x + 0.125 + x2 = 0.0 + 0.125

Reorder the terms:
-0.125 + 0.125 + -0.8x + x2 = 0.0 + 0.125

Combine like terms: -0.125 + 0.125 = 0.000
0.000 + -0.8x + x2 = 0.0 + 0.125
-0.8x + x2 = 0.0 + 0.125

Combine like terms: 0.0 + 0.125 = 0.125
-0.8x + x2 = 0.125

The x term is -0.8x.  Take half its coefficient (-0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
-0.8x + 0.16 + x2 = 0.125 + 0.16

Reorder the terms:
0.16 + -0.8x + x2 = 0.125 + 0.16

Combine like terms: 0.125 + 0.16 = 0.285
0.16 + -0.8x + x2 = 0.285

Factor a perfect square on the left side:
(x + -0.4)(x + -0.4) = 0.285

Calculate the square root of the right side: 0.533853913

Break this problem into two subproblems by setting 
(x + -0.4) equal to 0.533853913 and -0.533853913.

Subproblem 1

x + -0.4 = 0.533853913 Simplifying x + -0.4 = 0.533853913 Reorder the terms: -0.4 + x = 0.533853913 Solving -0.4 + x = 0.533853913 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4' to each side of the equation. -0.4 + 0.4 + x = 0.533853913 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + x = 0.533853913 + 0.4 x = 0.533853913 + 0.4 Combine like terms: 0.533853913 + 0.4 = 0.933853913 x = 0.933853913 Simplifying x = 0.933853913

Subproblem 2

x + -0.4 = -0.533853913 Simplifying x + -0.4 = -0.533853913 Reorder the terms: -0.4 + x = -0.533853913 Solving -0.4 + x = -0.533853913 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4' to each side of the equation. -0.4 + 0.4 + x = -0.533853913 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + x = -0.533853913 + 0.4 x = -0.533853913 + 0.4 Combine like terms: -0.533853913 + 0.4 = -0.133853913 x = -0.133853913 Simplifying x = -0.133853913

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.933853913, -0.133853913}

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