x^2+100x-9=0

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Solution for x^2+100x-9=0 equation:


Simplifying
x2 + 100x + -9 = 0

Reorder the terms:
-9 + 100x + x2 = 0

Solving
-9 + 100x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + 100x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + 100x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 100x + x2 = 0 + 9
100x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
100x + x2 = 9

The x term is 100x.  Take half its coefficient (50).
Square it (2500) and add it to both sides.

Add '2500' to each side of the equation.
100x + 2500 + x2 = 9 + 2500

Reorder the terms:
2500 + 100x + x2 = 9 + 2500

Combine like terms: 9 + 2500 = 2509
2500 + 100x + x2 = 2509

Factor a perfect square on the left side:
(x + 50)(x + 50) = 2509

Calculate the square root of the right side: 50.089919145

Break this problem into two subproblems by setting 
(x + 50) equal to 50.089919145 and -50.089919145.

Subproblem 1

x + 50 = 50.089919145 Simplifying x + 50 = 50.089919145 Reorder the terms: 50 + x = 50.089919145 Solving 50 + x = 50.089919145 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-50' to each side of the equation. 50 + -50 + x = 50.089919145 + -50 Combine like terms: 50 + -50 = 0 0 + x = 50.089919145 + -50 x = 50.089919145 + -50 Combine like terms: 50.089919145 + -50 = 0.089919145 x = 0.089919145 Simplifying x = 0.089919145

Subproblem 2

x + 50 = -50.089919145 Simplifying x + 50 = -50.089919145 Reorder the terms: 50 + x = -50.089919145 Solving 50 + x = -50.089919145 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-50' to each side of the equation. 50 + -50 + x = -50.089919145 + -50 Combine like terms: 50 + -50 = 0 0 + x = -50.089919145 + -50 x = -50.089919145 + -50 Combine like terms: -50.089919145 + -50 = -100.089919145 x = -100.089919145 Simplifying x = -100.089919145

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.089919145, -100.089919145}

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