x^2+20x-702=0

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Solution for x^2+20x-702=0 equation:


Simplifying
x2 + 20x + -702 = 0

Reorder the terms:
-702 + 20x + x2 = 0

Solving
-702 + 20x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '702' to each side of the equation.
-702 + 20x + 702 + x2 = 0 + 702

Reorder the terms:
-702 + 702 + 20x + x2 = 0 + 702

Combine like terms: -702 + 702 = 0
0 + 20x + x2 = 0 + 702
20x + x2 = 0 + 702

Combine like terms: 0 + 702 = 702
20x + x2 = 702

The x term is 20x.  Take half its coefficient (10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
20x + 100 + x2 = 702 + 100

Reorder the terms:
100 + 20x + x2 = 702 + 100

Combine like terms: 702 + 100 = 802
100 + 20x + x2 = 802

Factor a perfect square on the left side:
(x + 10)(x + 10) = 802

Calculate the square root of the right side: 28.319604517

Break this problem into two subproblems by setting 
(x + 10) equal to 28.319604517 and -28.319604517.

Subproblem 1

x + 10 = 28.319604517 Simplifying x + 10 = 28.319604517 Reorder the terms: 10 + x = 28.319604517 Solving 10 + x = 28.319604517 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = 28.319604517 + -10 Combine like terms: 10 + -10 = 0 0 + x = 28.319604517 + -10 x = 28.319604517 + -10 Combine like terms: 28.319604517 + -10 = 18.319604517 x = 18.319604517 Simplifying x = 18.319604517

Subproblem 2

x + 10 = -28.319604517 Simplifying x + 10 = -28.319604517 Reorder the terms: 10 + x = -28.319604517 Solving 10 + x = -28.319604517 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = -28.319604517 + -10 Combine like terms: 10 + -10 = 0 0 + x = -28.319604517 + -10 x = -28.319604517 + -10 Combine like terms: -28.319604517 + -10 = -38.319604517 x = -38.319604517 Simplifying x = -38.319604517

Solution

The solution to the problem is based on the solutions from the subproblems. x = {18.319604517, -38.319604517}

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