16x^2-80x+25=0

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Solution for 16x^2-80x+25=0 equation:


Simplifying
16x2 + -80x + 25 = 0

Reorder the terms:
25 + -80x + 16x2 = 0

Solving
25 + -80x + 16x2 = 0

Solving for variable 'x'.

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

Divide each side by '16'.
1.5625 + -5x + x2 = 0

Move the constant term to the right:

Add '-1.5625' to each side of the equation.
1.5625 + -5x + -1.5625 + x2 = 0 + -1.5625

Reorder the terms:
1.5625 + -1.5625 + -5x + x2 = 0 + -1.5625

Combine like terms: 1.5625 + -1.5625 = 0.0000
0.0000 + -5x + x2 = 0 + -1.5625
-5x + x2 = 0 + -1.5625

Combine like terms: 0 + -1.5625 = -1.5625
-5x + x2 = -1.5625

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = -1.5625 + 6.25

Reorder the terms:
6.25 + -5x + x2 = -1.5625 + 6.25

Combine like terms: -1.5625 + 6.25 = 4.6875
6.25 + -5x + x2 = 4.6875

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 4.6875

Calculate the square root of the right side: 2.165063509

Break this problem into two subproblems by setting 
(x + -2.5) equal to 2.165063509 and -2.165063509.

Subproblem 1

x + -2.5 = 2.165063509 Simplifying x + -2.5 = 2.165063509 Reorder the terms: -2.5 + x = 2.165063509 Solving -2.5 + x = 2.165063509 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 2.165063509 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 2.165063509 + 2.5 x = 2.165063509 + 2.5 Combine like terms: 2.165063509 + 2.5 = 4.665063509 x = 4.665063509 Simplifying x = 4.665063509

Subproblem 2

x + -2.5 = -2.165063509 Simplifying x + -2.5 = -2.165063509 Reorder the terms: -2.5 + x = -2.165063509 Solving -2.5 + x = -2.165063509 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -2.165063509 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -2.165063509 + 2.5 x = -2.165063509 + 2.5 Combine like terms: -2.165063509 + 2.5 = 0.334936491 x = 0.334936491 Simplifying x = 0.334936491

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.665063509, 0.334936491}

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