x+8x^2=100

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Solution for x+8x^2=100 equation:


Simplifying
x + 8x2 = 100

Solving
x + 8x2 = 100

Solving for variable 'x'.

Reorder the terms:
-100 + x + 8x2 = 100 + -100

Combine like terms: 100 + -100 = 0
-100 + x + 8x2 = 0

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

Divide each side by '8'.
-12.5 + 0.125x + x2 = 0

Move the constant term to the right:

Add '12.5' to each side of the equation.
-12.5 + 0.125x + 12.5 + x2 = 0 + 12.5

Reorder the terms:
-12.5 + 12.5 + 0.125x + x2 = 0 + 12.5

Combine like terms: -12.5 + 12.5 = 0.0
0.0 + 0.125x + x2 = 0 + 12.5
0.125x + x2 = 0 + 12.5

Combine like terms: 0 + 12.5 = 12.5
0.125x + x2 = 12.5

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.125x + 0.25 + x2 = 12.5 + 0.25

Reorder the terms:
0.25 + 0.125x + x2 = 12.5 + 0.25

Combine like terms: 12.5 + 0.25 = 12.75
0.25 + 0.125x + x2 = 12.75

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 12.75

Calculate the square root of the right side: 3.570714214

Break this problem into two subproblems by setting 
(x + 0.5) equal to 3.570714214 and -3.570714214.

Subproblem 1

x + 0.5 = 3.570714214 Simplifying x + 0.5 = 3.570714214 Reorder the terms: 0.5 + x = 3.570714214 Solving 0.5 + x = 3.570714214 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 3.570714214 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 3.570714214 + -0.5 x = 3.570714214 + -0.5 Combine like terms: 3.570714214 + -0.5 = 3.070714214 x = 3.070714214 Simplifying x = 3.070714214

Subproblem 2

x + 0.5 = -3.570714214 Simplifying x + 0.5 = -3.570714214 Reorder the terms: 0.5 + x = -3.570714214 Solving 0.5 + x = -3.570714214 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -3.570714214 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -3.570714214 + -0.5 x = -3.570714214 + -0.5 Combine like terms: -3.570714214 + -0.5 = -4.070714214 x = -4.070714214 Simplifying x = -4.070714214

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.070714214, -4.070714214}

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