(0.5x^2)+(10x)-(8)=0

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Solution for (0.5x^2)+(10x)-(8)=0 equation:


Simplifying
(0.5x2) + (10x) + -1(8) = 0

Multiply -1 * 8
(0.5x2) + (10x) + -8 = 0

Reorder the terms:
-8 + (10x) + (0.5x2) = 0

Solving
-8 + (10x) + (0.5x2) = 0

Solving for variable 'x'.

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

Divide each side by '0.5'.
-16 + (20x) + x2 = 0

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + (20x) + 16 + x2 = 0 + 16

Reorder the terms:
-16 + 16 + (20x) + x2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + (20x) + x2 = 0 + 16
(20x) + x2 = 0 + 16

Combine like terms: 0 + 16 = 16
(20x) + x2 = 16

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 = 16 + 100

Reorder the terms:
100 + (20x) + x2 = 16 + 100

Combine like terms: 16 + 100 = 116
100 + (20x) + x2 = 116

Factor a perfect square on the left side:
((x) + 10)((x) + 10) = 116

Calculate the square root of the right side: 10.770329614

Break this problem into two subproblems by setting 
((x) + 10) equal to 10.770329614 and -10.770329614.

Subproblem 1

(x) + 10 = 10.770329614 Simplifying (x) + 10 = 10.770329614 x + 10 = 10.770329614 Reorder the terms: 10 + x = 10.770329614 Solving 10 + x = 10.770329614 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 = 10.770329614 + -10 Combine like terms: 10 + -10 = 0 0 + x = 10.770329614 + -10 x = 10.770329614 + -10 Combine like terms: 10.770329614 + -10 = 0.770329614 x = 0.770329614 Simplifying x = 0.770329614

Subproblem 2

(x) + 10 = -10.770329614 Simplifying (x) + 10 = -10.770329614 x + 10 = -10.770329614 Reorder the terms: 10 + x = -10.770329614 Solving 10 + x = -10.770329614 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 = -10.770329614 + -10 Combine like terms: 10 + -10 = 0 0 + x = -10.770329614 + -10 x = -10.770329614 + -10 Combine like terms: -10.770329614 + -10 = -20.770329614 x = -20.770329614 Simplifying x = -20.770329614

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.770329614, -20.770329614}

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