x^2-5=-7x

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Solution for x^2-5=-7x equation:


Simplifying
x2 + -5 = -7x

Reorder the terms:
-5 + x2 = -7x

Solving
-5 + x2 = -7x

Solving for variable 'x'.

Reorder the terms:
-5 + 7x + x2 = -7x + 7x

Combine like terms: -7x + 7x = 0
-5 + 7x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + 7x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + 7x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + 7x + x2 = 0 + 5
7x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
7x + x2 = 5

The x term is 7x.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7x + 12.25 + x2 = 5 + 12.25

Reorder the terms:
12.25 + 7x + x2 = 5 + 12.25

Combine like terms: 5 + 12.25 = 17.25
12.25 + 7x + x2 = 17.25

Factor a perfect square on the left side:
(x + 3.5)(x + 3.5) = 17.25

Calculate the square root of the right side: 4.153311931

Break this problem into two subproblems by setting 
(x + 3.5) equal to 4.153311931 and -4.153311931.

Subproblem 1

x + 3.5 = 4.153311931 Simplifying x + 3.5 = 4.153311931 Reorder the terms: 3.5 + x = 4.153311931 Solving 3.5 + x = 4.153311931 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = 4.153311931 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = 4.153311931 + -3.5 x = 4.153311931 + -3.5 Combine like terms: 4.153311931 + -3.5 = 0.653311931 x = 0.653311931 Simplifying x = 0.653311931

Subproblem 2

x + 3.5 = -4.153311931 Simplifying x + 3.5 = -4.153311931 Reorder the terms: 3.5 + x = -4.153311931 Solving 3.5 + x = -4.153311931 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + x = -4.153311931 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + x = -4.153311931 + -3.5 x = -4.153311931 + -3.5 Combine like terms: -4.153311931 + -3.5 = -7.653311931 x = -7.653311931 Simplifying x = -7.653311931

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.653311931, -7.653311931}

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