2x^2-10x+25=20

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Solution for 2x^2-10x+25=20 equation:


Simplifying
2x2 + -10x + 25 = 20

Reorder the terms:
25 + -10x + 2x2 = 20

Solving
25 + -10x + 2x2 = 20

Solving for variable 'x'.

Reorder the terms:
25 + -20 + -10x + 2x2 = 20 + -20

Combine like terms: 25 + -20 = 5
5 + -10x + 2x2 = 20 + -20

Combine like terms: 20 + -20 = 0
5 + -10x + 2x2 = 0

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

Divide each side by '2'.
2.5 + -5x + x2 = 0

Move the constant term to the right:

Add '-2.5' to each side of the equation.
2.5 + -5x + -2.5 + x2 = 0 + -2.5

Reorder the terms:
2.5 + -2.5 + -5x + x2 = 0 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + -5x + x2 = 0 + -2.5
-5x + x2 = 0 + -2.5

Combine like terms: 0 + -2.5 = -2.5
-5x + x2 = -2.5

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 = -2.5 + 6.25

Reorder the terms:
6.25 + -5x + x2 = -2.5 + 6.25

Combine like terms: -2.5 + 6.25 = 3.75
6.25 + -5x + x2 = 3.75

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 3.75

Calculate the square root of the right side: 1.936491673

Break this problem into two subproblems by setting 
(x + -2.5) equal to 1.936491673 and -1.936491673.

Subproblem 1

x + -2.5 = 1.936491673 Simplifying x + -2.5 = 1.936491673 Reorder the terms: -2.5 + x = 1.936491673 Solving -2.5 + x = 1.936491673 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 = 1.936491673 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 1.936491673 + 2.5 x = 1.936491673 + 2.5 Combine like terms: 1.936491673 + 2.5 = 4.436491673 x = 4.436491673 Simplifying x = 4.436491673

Subproblem 2

x + -2.5 = -1.936491673 Simplifying x + -2.5 = -1.936491673 Reorder the terms: -2.5 + x = -1.936491673 Solving -2.5 + x = -1.936491673 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 = -1.936491673 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -1.936491673 + 2.5 x = -1.936491673 + 2.5 Combine like terms: -1.936491673 + 2.5 = 0.563508327 x = 0.563508327 Simplifying x = 0.563508327

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.436491673, 0.563508327}

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