x^2+22x-85=0

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Solution for x^2+22x-85=0 equation:


Simplifying
x2 + 22x + -85 = 0

Reorder the terms:
-85 + 22x + x2 = 0

Solving
-85 + 22x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '85' to each side of the equation.
-85 + 22x + 85 + x2 = 0 + 85

Reorder the terms:
-85 + 85 + 22x + x2 = 0 + 85

Combine like terms: -85 + 85 = 0
0 + 22x + x2 = 0 + 85
22x + x2 = 0 + 85

Combine like terms: 0 + 85 = 85
22x + x2 = 85

The x term is 22x.  Take half its coefficient (11).
Square it (121) and add it to both sides.

Add '121' to each side of the equation.
22x + 121 + x2 = 85 + 121

Reorder the terms:
121 + 22x + x2 = 85 + 121

Combine like terms: 85 + 121 = 206
121 + 22x + x2 = 206

Factor a perfect square on the left side:
(x + 11)(x + 11) = 206

Calculate the square root of the right side: 14.352700094

Break this problem into two subproblems by setting 
(x + 11) equal to 14.352700094 and -14.352700094.

Subproblem 1

x + 11 = 14.352700094 Simplifying x + 11 = 14.352700094 Reorder the terms: 11 + x = 14.352700094 Solving 11 + x = 14.352700094 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + x = 14.352700094 + -11 Combine like terms: 11 + -11 = 0 0 + x = 14.352700094 + -11 x = 14.352700094 + -11 Combine like terms: 14.352700094 + -11 = 3.352700094 x = 3.352700094 Simplifying x = 3.352700094

Subproblem 2

x + 11 = -14.352700094 Simplifying x + 11 = -14.352700094 Reorder the terms: 11 + x = -14.352700094 Solving 11 + x = -14.352700094 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + x = -14.352700094 + -11 Combine like terms: 11 + -11 = 0 0 + x = -14.352700094 + -11 x = -14.352700094 + -11 Combine like terms: -14.352700094 + -11 = -25.352700094 x = -25.352700094 Simplifying x = -25.352700094

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.352700094, -25.352700094}

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