0.25x^2-10x+64=0

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Solution for 0.25x^2-10x+64=0 equation:


Simplifying
0.25x2 + -10x + 64 = 0

Reorder the terms:
64 + -10x + 0.25x2 = 0

Solving
64 + -10x + 0.25x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.25'.
256 + -40x + x2 = 0

Move the constant term to the right:

Add '-256' to each side of the equation.
256 + -40x + -256 + x2 = 0 + -256

Reorder the terms:
256 + -256 + -40x + x2 = 0 + -256

Combine like terms: 256 + -256 = 0
0 + -40x + x2 = 0 + -256
-40x + x2 = 0 + -256

Combine like terms: 0 + -256 = -256
-40x + x2 = -256

The x term is -40x.  Take half its coefficient (-20).
Square it (400) and add it to both sides.

Add '400' to each side of the equation.
-40x + 400 + x2 = -256 + 400

Reorder the terms:
400 + -40x + x2 = -256 + 400

Combine like terms: -256 + 400 = 144
400 + -40x + x2 = 144

Factor a perfect square on the left side:
(x + -20)(x + -20) = 144

Calculate the square root of the right side: 12

Break this problem into two subproblems by setting 
(x + -20) equal to 12 and -12.

Subproblem 1

x + -20 = 12 Simplifying x + -20 = 12 Reorder the terms: -20 + x = 12 Solving -20 + x = 12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + x = 12 + 20 Combine like terms: -20 + 20 = 0 0 + x = 12 + 20 x = 12 + 20 Combine like terms: 12 + 20 = 32 x = 32 Simplifying x = 32

Subproblem 2

x + -20 = -12 Simplifying x + -20 = -12 Reorder the terms: -20 + x = -12 Solving -20 + x = -12 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + x = -12 + 20 Combine like terms: -20 + 20 = 0 0 + x = -12 + 20 x = -12 + 20 Combine like terms: -12 + 20 = 8 x = 8 Simplifying x = 8

Solution

The solution to the problem is based on the solutions from the subproblems. x = {32, 8}

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