(x*x)+4x-105=0

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Solution for (x*x)+4x-105=0 equation:


Simplifying
(x * x) + 4x + -105 = 0

Multiply x * x
(x2) + 4x + -105 = 0
x2 + 4x + -105 = 0

Reorder the terms:
-105 + 4x + x2 = 0

Solving
-105 + 4x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '105' to each side of the equation.
-105 + 4x + 105 + x2 = 0 + 105

Reorder the terms:
-105 + 105 + 4x + x2 = 0 + 105

Combine like terms: -105 + 105 = 0
0 + 4x + x2 = 0 + 105
4x + x2 = 0 + 105

Combine like terms: 0 + 105 = 105
4x + x2 = 105

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 = 105 + 4

Reorder the terms:
4 + 4x + x2 = 105 + 4

Combine like terms: 105 + 4 = 109
4 + 4x + x2 = 109

Factor a perfect square on the left side:
(x + 2)(x + 2) = 109

Calculate the square root of the right side: 10.440306509

Break this problem into two subproblems by setting 
(x + 2) equal to 10.440306509 and -10.440306509.

Subproblem 1

x + 2 = 10.440306509 Simplifying x + 2 = 10.440306509 Reorder the terms: 2 + x = 10.440306509 Solving 2 + x = 10.440306509 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 = 10.440306509 + -2 Combine like terms: 2 + -2 = 0 0 + x = 10.440306509 + -2 x = 10.440306509 + -2 Combine like terms: 10.440306509 + -2 = 8.440306509 x = 8.440306509 Simplifying x = 8.440306509

Subproblem 2

x + 2 = -10.440306509 Simplifying x + 2 = -10.440306509 Reorder the terms: 2 + x = -10.440306509 Solving 2 + x = -10.440306509 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 = -10.440306509 + -2 Combine like terms: 2 + -2 = 0 0 + x = -10.440306509 + -2 x = -10.440306509 + -2 Combine like terms: -10.440306509 + -2 = -12.440306509 x = -12.440306509 Simplifying x = -12.440306509

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.440306509, -12.440306509}

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