x^2+21x+50=0

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Solution for x^2+21x+50=0 equation:


Simplifying
x2 + 21x + 50 = 0

Reorder the terms:
50 + 21x + x2 = 0

Solving
50 + 21x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-50' to each side of the equation.
50 + 21x + -50 + x2 = 0 + -50

Reorder the terms:
50 + -50 + 21x + x2 = 0 + -50

Combine like terms: 50 + -50 = 0
0 + 21x + x2 = 0 + -50
21x + x2 = 0 + -50

Combine like terms: 0 + -50 = -50
21x + x2 = -50

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 = -50 + 110.25

Reorder the terms:
110.25 + 21x + x2 = -50 + 110.25

Combine like terms: -50 + 110.25 = 60.25
110.25 + 21x + x2 = 60.25

Factor a perfect square on the left side:
(x + 10.5)(x + 10.5) = 60.25

Calculate the square root of the right side: 7.762087348

Break this problem into two subproblems by setting 
(x + 10.5) equal to 7.762087348 and -7.762087348.

Subproblem 1

x + 10.5 = 7.762087348 Simplifying x + 10.5 = 7.762087348 Reorder the terms: 10.5 + x = 7.762087348 Solving 10.5 + x = 7.762087348 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 = 7.762087348 + -10.5 Combine like terms: 10.5 + -10.5 = 0.0 0.0 + x = 7.762087348 + -10.5 x = 7.762087348 + -10.5 Combine like terms: 7.762087348 + -10.5 = -2.737912652 x = -2.737912652 Simplifying x = -2.737912652

Subproblem 2

x + 10.5 = -7.762087348 Simplifying x + 10.5 = -7.762087348 Reorder the terms: 10.5 + x = -7.762087348 Solving 10.5 + x = -7.762087348 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 = -7.762087348 + -10.5 Combine like terms: 10.5 + -10.5 = 0.0 0.0 + x = -7.762087348 + -10.5 x = -7.762087348 + -10.5 Combine like terms: -7.762087348 + -10.5 = -18.262087348 x = -18.262087348 Simplifying x = -18.262087348

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-2.737912652, -18.262087348}

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