25=4x+x^2

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Solution for 25=4x+x^2 equation:


Simplifying
25 = 4x + x2

Solving
25 = 4x + x2

Solving for variable 'x'.

Reorder the terms:
25 + -4x + -1x2 = 4x + -4x + x2 + -1x2

Combine like terms: 4x + -4x = 0
25 + -4x + -1x2 = 0 + x2 + -1x2
25 + -4x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
25 + -4x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-25 + 4x + x2 = 0

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + 4x + 25 + x2 = 0 + 25

Reorder the terms:
-25 + 25 + 4x + x2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + 4x + x2 = 0 + 25
4x + x2 = 0 + 25

Combine like terms: 0 + 25 = 25
4x + x2 = 25

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 25 + 4

Reorder the terms:
4 + 4x + x2 = 25 + 4

Combine like terms: 25 + 4 = 29
4 + 4x + x2 = 29

Factor a perfect square on the left side:
(x + 2)(x + 2) = 29

Calculate the square root of the right side: 5.385164807

Break this problem into two subproblems by setting 
(x + 2) equal to 5.385164807 and -5.385164807.

Subproblem 1

x + 2 = 5.385164807 Simplifying x + 2 = 5.385164807 Reorder the terms: 2 + x = 5.385164807 Solving 2 + x = 5.385164807 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 5.385164807 + -2 Combine like terms: 2 + -2 = 0 0 + x = 5.385164807 + -2 x = 5.385164807 + -2 Combine like terms: 5.385164807 + -2 = 3.385164807 x = 3.385164807 Simplifying x = 3.385164807

Subproblem 2

x + 2 = -5.385164807 Simplifying x + 2 = -5.385164807 Reorder the terms: 2 + x = -5.385164807 Solving 2 + x = -5.385164807 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -5.385164807 + -2 Combine like terms: 2 + -2 = 0 0 + x = -5.385164807 + -2 x = -5.385164807 + -2 Combine like terms: -5.385164807 + -2 = -7.385164807 x = -7.385164807 Simplifying x = -7.385164807

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.385164807, -7.385164807}

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