x^2-2.5x+1.5625=0

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Solution for x^2-2.5x+1.5625=0 equation:


Simplifying
x2 + -2.5x + 1.5625 = 0

Reorder the terms:
1.5625 + -2.5x + x2 = 0

Solving
1.5625 + -2.5x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-1.5625' to each side of the equation.
1.5625 + -2.5x + -1.5625 + x2 = 0 + -1.5625

Reorder the terms:
1.5625 + -1.5625 + -2.5x + x2 = 0 + -1.5625

Combine like terms: 1.5625 + -1.5625 = 0.0000
0.0000 + -2.5x + x2 = 0 + -1.5625
-2.5x + x2 = 0 + -1.5625

Combine like terms: 0 + -1.5625 = -1.5625
-2.5x + x2 = -1.5625

The x term is -2.5x.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5x + 1.5625 + x2 = -1.5625 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = -1.5625 + 1.5625

Combine like terms: -1.5625 + 1.5625 = 0.0000
1.5625 + -2.5x + x2 = 0.0000

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = 0.0000

Calculate the square root of the right side: 0.0000

Break this problem into two subproblems by setting 
(x + -1.25) equal to 0.0000 and 0.0000.

Subproblem 1

x + -1.25 = 0.0000 Simplifying x + -1.25 = 0.0000 Reorder the terms: -1.25 + x = 0.0000 Solving -1.25 + x = 0.0000 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = 0.0000 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 0.0000 + 1.25 x = 0.0000 + 1.25 Combine like terms: 0.0000 + 1.25 = 1.25 x = 1.25 Simplifying x = 1.25

Subproblem 2

x + -1.25 = 0.0000 Simplifying x + -1.25 = 0.0000 Reorder the terms: -1.25 + x = 0.0000 Solving -1.25 + x = 0.0000 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = 0.0000 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 0.0000 + 1.25 x = 0.0000 + 1.25 Combine like terms: 0.0000 + 1.25 = 1.25 x = 1.25 Simplifying x = 1.25

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.25, 1.25}

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