2x^2-5x+2=25

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Solution for 2x^2-5x+2=25 equation:


Simplifying
2x2 + -5x + 2 = 25

Reorder the terms:
2 + -5x + 2x2 = 25

Solving
2 + -5x + 2x2 = 25

Solving for variable 'x'.

Reorder the terms:
2 + -25 + -5x + 2x2 = 25 + -25

Combine like terms: 2 + -25 = -23
-23 + -5x + 2x2 = 25 + -25

Combine like terms: 25 + -25 = 0
-23 + -5x + 2x2 = 0

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

Divide each side by '2'.
-11.5 + -2.5x + x2 = 0

Move the constant term to the right:

Add '11.5' to each side of the equation.
-11.5 + -2.5x + 11.5 + x2 = 0 + 11.5

Reorder the terms:
-11.5 + 11.5 + -2.5x + x2 = 0 + 11.5

Combine like terms: -11.5 + 11.5 = 0.0
0.0 + -2.5x + x2 = 0 + 11.5
-2.5x + x2 = 0 + 11.5

Combine like terms: 0 + 11.5 = 11.5
-2.5x + x2 = 11.5

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 = 11.5 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = 11.5 + 1.5625

Combine like terms: 11.5 + 1.5625 = 13.0625
1.5625 + -2.5x + x2 = 13.0625

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = 13.0625

Calculate the square root of the right side: 3.614208074

Break this problem into two subproblems by setting 
(x + -1.25) equal to 3.614208074 and -3.614208074.

Subproblem 1

x + -1.25 = 3.614208074 Simplifying x + -1.25 = 3.614208074 Reorder the terms: -1.25 + x = 3.614208074 Solving -1.25 + x = 3.614208074 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 = 3.614208074 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 3.614208074 + 1.25 x = 3.614208074 + 1.25 Combine like terms: 3.614208074 + 1.25 = 4.864208074 x = 4.864208074 Simplifying x = 4.864208074

Subproblem 2

x + -1.25 = -3.614208074 Simplifying x + -1.25 = -3.614208074 Reorder the terms: -1.25 + x = -3.614208074 Solving -1.25 + x = -3.614208074 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 = -3.614208074 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = -3.614208074 + 1.25 x = -3.614208074 + 1.25 Combine like terms: -3.614208074 + 1.25 = -2.364208074 x = -2.364208074 Simplifying x = -2.364208074

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.864208074, -2.364208074}

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