5x^2-40x+16=0

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Solution for 5x^2-40x+16=0 equation:


Simplifying
5x2 + -40x + 16 = 0

Reorder the terms:
16 + -40x + 5x2 = 0

Solving
16 + -40x + 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'.
3.2 + -8x + x2 = 0

Move the constant term to the right:

Add '-3.2' to each side of the equation.
3.2 + -8x + -3.2 + x2 = 0 + -3.2

Reorder the terms:
3.2 + -3.2 + -8x + x2 = 0 + -3.2

Combine like terms: 3.2 + -3.2 = 0.0
0.0 + -8x + x2 = 0 + -3.2
-8x + x2 = 0 + -3.2

Combine like terms: 0 + -3.2 = -3.2
-8x + x2 = -3.2

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = -3.2 + 16

Reorder the terms:
16 + -8x + x2 = -3.2 + 16

Combine like terms: -3.2 + 16 = 12.8
16 + -8x + x2 = 12.8

Factor a perfect square on the left side:
(x + -4)(x + -4) = 12.8

Calculate the square root of the right side: 3.577708764

Break this problem into two subproblems by setting 
(x + -4) equal to 3.577708764 and -3.577708764.

Subproblem 1

x + -4 = 3.577708764 Simplifying x + -4 = 3.577708764 Reorder the terms: -4 + x = 3.577708764 Solving -4 + x = 3.577708764 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 3.577708764 + 4 Combine like terms: -4 + 4 = 0 0 + x = 3.577708764 + 4 x = 3.577708764 + 4 Combine like terms: 3.577708764 + 4 = 7.577708764 x = 7.577708764 Simplifying x = 7.577708764

Subproblem 2

x + -4 = -3.577708764 Simplifying x + -4 = -3.577708764 Reorder the terms: -4 + x = -3.577708764 Solving -4 + x = -3.577708764 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -3.577708764 + 4 Combine like terms: -4 + 4 = 0 0 + x = -3.577708764 + 4 x = -3.577708764 + 4 Combine like terms: -3.577708764 + 4 = 0.422291236 x = 0.422291236 Simplifying x = 0.422291236

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.577708764, 0.422291236}

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