x^2+4x-79=0

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Solution for x^2+4x-79=0 equation:


Simplifying
x2 + 4x + -79 = 0

Reorder the terms:
-79 + 4x + x2 = 0

Solving
-79 + 4x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '79' to each side of the equation.
-79 + 4x + 79 + x2 = 0 + 79

Reorder the terms:
-79 + 79 + 4x + x2 = 0 + 79

Combine like terms: -79 + 79 = 0
0 + 4x + x2 = 0 + 79
4x + x2 = 0 + 79

Combine like terms: 0 + 79 = 79
4x + x2 = 79

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 = 79 + 4

Reorder the terms:
4 + 4x + x2 = 79 + 4

Combine like terms: 79 + 4 = 83
4 + 4x + x2 = 83

Factor a perfect square on the left side:
(x + 2)(x + 2) = 83

Calculate the square root of the right side: 9.110433579

Break this problem into two subproblems by setting 
(x + 2) equal to 9.110433579 and -9.110433579.

Subproblem 1

x + 2 = 9.110433579 Simplifying x + 2 = 9.110433579 Reorder the terms: 2 + x = 9.110433579 Solving 2 + x = 9.110433579 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 = 9.110433579 + -2 Combine like terms: 2 + -2 = 0 0 + x = 9.110433579 + -2 x = 9.110433579 + -2 Combine like terms: 9.110433579 + -2 = 7.110433579 x = 7.110433579 Simplifying x = 7.110433579

Subproblem 2

x + 2 = -9.110433579 Simplifying x + 2 = -9.110433579 Reorder the terms: 2 + x = -9.110433579 Solving 2 + x = -9.110433579 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 = -9.110433579 + -2 Combine like terms: 2 + -2 = 0 0 + x = -9.110433579 + -2 x = -9.110433579 + -2 Combine like terms: -9.110433579 + -2 = -11.110433579 x = -11.110433579 Simplifying x = -11.110433579

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.110433579, -11.110433579}

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