x^2-28x=-25

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Solution for x^2-28x=-25 equation:


Simplifying
x2 + -28x = -25

Reorder the terms:
-28x + x2 = -25

Solving
-28x + x2 = -25

Solving for variable 'x'.

Reorder the terms:
25 + -28x + x2 = -25 + 25

Combine like terms: -25 + 25 = 0
25 + -28x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-25' to each side of the equation.
25 + -28x + -25 + x2 = 0 + -25

Reorder the terms:
25 + -25 + -28x + x2 = 0 + -25

Combine like terms: 25 + -25 = 0
0 + -28x + x2 = 0 + -25
-28x + x2 = 0 + -25

Combine like terms: 0 + -25 = -25
-28x + x2 = -25

The x term is -28x.  Take half its coefficient (-14).
Square it (196) and add it to both sides.

Add '196' to each side of the equation.
-28x + 196 + x2 = -25 + 196

Reorder the terms:
196 + -28x + x2 = -25 + 196

Combine like terms: -25 + 196 = 171
196 + -28x + x2 = 171

Factor a perfect square on the left side:
(x + -14)(x + -14) = 171

Calculate the square root of the right side: 13.076696831

Break this problem into two subproblems by setting 
(x + -14) equal to 13.076696831 and -13.076696831.

Subproblem 1

x + -14 = 13.076696831 Simplifying x + -14 = 13.076696831 Reorder the terms: -14 + x = 13.076696831 Solving -14 + x = 13.076696831 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + x = 13.076696831 + 14 Combine like terms: -14 + 14 = 0 0 + x = 13.076696831 + 14 x = 13.076696831 + 14 Combine like terms: 13.076696831 + 14 = 27.076696831 x = 27.076696831 Simplifying x = 27.076696831

Subproblem 2

x + -14 = -13.076696831 Simplifying x + -14 = -13.076696831 Reorder the terms: -14 + x = -13.076696831 Solving -14 + x = -13.076696831 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + x = -13.076696831 + 14 Combine like terms: -14 + 14 = 0 0 + x = -13.076696831 + 14 x = -13.076696831 + 14 Combine like terms: -13.076696831 + 14 = 0.923303169 x = 0.923303169 Simplifying x = 0.923303169

Solution

The solution to the problem is based on the solutions from the subproblems. x = {27.076696831, 0.923303169}

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