25x^2-4=8x

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Solution for 25x^2-4=8x equation:


Simplifying
25x2 + -4 = 8x

Reorder the terms:
-4 + 25x2 = 8x

Solving
-4 + 25x2 = 8x

Solving for variable 'x'.

Reorder the terms:
-4 + -8x + 25x2 = 8x + -8x

Combine like terms: 8x + -8x = 0
-4 + -8x + 25x2 = 0

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

Divide each side by '25'.
-0.16 + -0.32x + x2 = 0

Move the constant term to the right:

Add '0.16' to each side of the equation.
-0.16 + -0.32x + 0.16 + x2 = 0 + 0.16

Reorder the terms:
-0.16 + 0.16 + -0.32x + x2 = 0 + 0.16

Combine like terms: -0.16 + 0.16 = 0.00
0.00 + -0.32x + x2 = 0 + 0.16
-0.32x + x2 = 0 + 0.16

Combine like terms: 0 + 0.16 = 0.16
-0.32x + x2 = 0.16

The x term is -0.32x.  Take half its coefficient (-0.16).
Square it (0.0256) and add it to both sides.

Add '0.0256' to each side of the equation.
-0.32x + 0.0256 + x2 = 0.16 + 0.0256

Reorder the terms:
0.0256 + -0.32x + x2 = 0.16 + 0.0256

Combine like terms: 0.16 + 0.0256 = 0.1856
0.0256 + -0.32x + x2 = 0.1856

Factor a perfect square on the left side:
(x + -0.16)(x + -0.16) = 0.1856

Calculate the square root of the right side: 0.430813185

Break this problem into two subproblems by setting 
(x + -0.16) equal to 0.430813185 and -0.430813185.

Subproblem 1

x + -0.16 = 0.430813185 Simplifying x + -0.16 = 0.430813185 Reorder the terms: -0.16 + x = 0.430813185 Solving -0.16 + x = 0.430813185 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.16' to each side of the equation. -0.16 + 0.16 + x = 0.430813185 + 0.16 Combine like terms: -0.16 + 0.16 = 0.00 0.00 + x = 0.430813185 + 0.16 x = 0.430813185 + 0.16 Combine like terms: 0.430813185 + 0.16 = 0.590813185 x = 0.590813185 Simplifying x = 0.590813185

Subproblem 2

x + -0.16 = -0.430813185 Simplifying x + -0.16 = -0.430813185 Reorder the terms: -0.16 + x = -0.430813185 Solving -0.16 + x = -0.430813185 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.16' to each side of the equation. -0.16 + 0.16 + x = -0.430813185 + 0.16 Combine like terms: -0.16 + 0.16 = 0.00 0.00 + x = -0.430813185 + 0.16 x = -0.430813185 + 0.16 Combine like terms: -0.430813185 + 0.16 = -0.270813185 x = -0.270813185 Simplifying x = -0.270813185

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.590813185, -0.270813185}

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