x^2+2x-25=7

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Solution for x^2+2x-25=7 equation:


Simplifying
x2 + 2x + -25 = 7

Reorder the terms:
-25 + 2x + x2 = 7

Solving
-25 + 2x + x2 = 7

Solving for variable 'x'.

Reorder the terms:
-25 + -7 + 2x + x2 = 7 + -7

Combine like terms: -25 + -7 = -32
-32 + 2x + x2 = 7 + -7

Combine like terms: 7 + -7 = 0
-32 + 2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '32' to each side of the equation.
-32 + 2x + 32 + x2 = 0 + 32

Reorder the terms:
-32 + 32 + 2x + x2 = 0 + 32

Combine like terms: -32 + 32 = 0
0 + 2x + x2 = 0 + 32
2x + x2 = 0 + 32

Combine like terms: 0 + 32 = 32
2x + x2 = 32

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 32 + 1

Reorder the terms:
1 + 2x + x2 = 32 + 1

Combine like terms: 32 + 1 = 33
1 + 2x + x2 = 33

Factor a perfect square on the left side:
(x + 1)(x + 1) = 33

Calculate the square root of the right side: 5.744562647

Break this problem into two subproblems by setting 
(x + 1) equal to 5.744562647 and -5.744562647.

Subproblem 1

x + 1 = 5.744562647 Simplifying x + 1 = 5.744562647 Reorder the terms: 1 + x = 5.744562647 Solving 1 + x = 5.744562647 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 5.744562647 + -1 Combine like terms: 1 + -1 = 0 0 + x = 5.744562647 + -1 x = 5.744562647 + -1 Combine like terms: 5.744562647 + -1 = 4.744562647 x = 4.744562647 Simplifying x = 4.744562647

Subproblem 2

x + 1 = -5.744562647 Simplifying x + 1 = -5.744562647 Reorder the terms: 1 + x = -5.744562647 Solving 1 + x = -5.744562647 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -5.744562647 + -1 Combine like terms: 1 + -1 = 0 0 + x = -5.744562647 + -1 x = -5.744562647 + -1 Combine like terms: -5.744562647 + -1 = -6.744562647 x = -6.744562647 Simplifying x = -6.744562647

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.744562647, -6.744562647}

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