x^2+21x-362=0

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Solution for x^2+21x-362=0 equation:


Simplifying
x2 + 21x + -362 = 0

Reorder the terms:
-362 + 21x + x2 = 0

Solving
-362 + 21x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '362' to each side of the equation.
-362 + 21x + 362 + x2 = 0 + 362

Reorder the terms:
-362 + 362 + 21x + x2 = 0 + 362

Combine like terms: -362 + 362 = 0
0 + 21x + x2 = 0 + 362
21x + x2 = 0 + 362

Combine like terms: 0 + 362 = 362
21x + x2 = 362

The x term is 21x.  Take half its coefficient (10.5).
Square it (110.25) and add it to both sides.

Add '110.25' to each side of the equation.
21x + 110.25 + x2 = 362 + 110.25

Reorder the terms:
110.25 + 21x + x2 = 362 + 110.25

Combine like terms: 362 + 110.25 = 472.25
110.25 + 21x + x2 = 472.25

Factor a perfect square on the left side:
(x + 10.5)(x + 10.5) = 472.25

Calculate the square root of the right side: 21.731313812

Break this problem into two subproblems by setting 
(x + 10.5) equal to 21.731313812 and -21.731313812.

Subproblem 1

x + 10.5 = 21.731313812 Simplifying x + 10.5 = 21.731313812 Reorder the terms: 10.5 + x = 21.731313812 Solving 10.5 + x = 21.731313812 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10.5' to each side of the equation. 10.5 + -10.5 + x = 21.731313812 + -10.5 Combine like terms: 10.5 + -10.5 = 0.0 0.0 + x = 21.731313812 + -10.5 x = 21.731313812 + -10.5 Combine like terms: 21.731313812 + -10.5 = 11.231313812 x = 11.231313812 Simplifying x = 11.231313812

Subproblem 2

x + 10.5 = -21.731313812 Simplifying x + 10.5 = -21.731313812 Reorder the terms: 10.5 + x = -21.731313812 Solving 10.5 + x = -21.731313812 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10.5' to each side of the equation. 10.5 + -10.5 + x = -21.731313812 + -10.5 Combine like terms: 10.5 + -10.5 = 0.0 0.0 + x = -21.731313812 + -10.5 x = -21.731313812 + -10.5 Combine like terms: -21.731313812 + -10.5 = -32.231313812 x = -32.231313812 Simplifying x = -32.231313812

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.231313812, -32.231313812}

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