0=.5x^2+10x-351

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Solution for 0=.5x^2+10x-351 equation:


Simplifying
0 = 0.5x2 + 10x + -351

Reorder the terms:
0 = -351 + 10x + 0.5x2

Solving
0 = -351 + 10x + 0.5x2

Solving for variable 'x'.

Combine like terms: 0 + 351 = 351
351 + -10x + -0.5x2 = -351 + 10x + 0.5x2 + 351 + -10x + -0.5x2

Reorder the terms:
351 + -10x + -0.5x2 = -351 + 351 + 10x + -10x + 0.5x2 + -0.5x2

Combine like terms: -351 + 351 = 0
351 + -10x + -0.5x2 = 0 + 10x + -10x + 0.5x2 + -0.5x2
351 + -10x + -0.5x2 = 10x + -10x + 0.5x2 + -0.5x2

Combine like terms: 10x + -10x = 0
351 + -10x + -0.5x2 = 0 + 0.5x2 + -0.5x2
351 + -10x + -0.5x2 = 0.5x2 + -0.5x2

Combine like terms: 0.5x2 + -0.5x2 = 0.0
351 + -10x + -0.5x2 = 0.0

Begin completing the square.  Divide all terms by
-0.5 the coefficient of the squared term: 

Divide each side by '-0.5'.
-702 + 20x + x2 = 0

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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