x^2+8x=.2

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


Simplifying
x2 + 8x = 0.2

Reorder the terms:
8x + x2 = 0.2

Solving
8x + x2 = 0.2

Solving for variable 'x'.

Reorder the terms:
-0.2 + 8x + x2 = 0.2 + -0.2

Combine like terms: 0.2 + -0.2 = 0.0
-0.2 + 8x + x2 = 0.0

Begin completing the square.

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + 8x + 0.2 + x2 = 0.0 + 0.2

Reorder the terms:
-0.2 + 0.2 + 8x + x2 = 0.0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + 8x + x2 = 0.0 + 0.2
8x + x2 = 0.0 + 0.2

Combine like terms: 0.0 + 0.2 = 0.2
8x + x2 = 0.2

The x term is 8x.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8x + 16 + x2 = 0.2 + 16

Reorder the terms:
16 + 8x + x2 = 0.2 + 16

Combine like terms: 0.2 + 16 = 16.2
16 + 8x + x2 = 16.2

Factor a perfect square on the left side:
(x + 4)(x + 4) = 16.2

Calculate the square root of the right side: 4.02492236

Break this problem into two subproblems by setting 
(x + 4) equal to 4.02492236 and -4.02492236.

Subproblem 1

x + 4 = 4.02492236 Simplifying x + 4 = 4.02492236 Reorder the terms: 4 + x = 4.02492236 Solving 4 + x = 4.02492236 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 4.02492236 + -4 Combine like terms: 4 + -4 = 0 0 + x = 4.02492236 + -4 x = 4.02492236 + -4 Combine like terms: 4.02492236 + -4 = 0.02492236 x = 0.02492236 Simplifying x = 0.02492236

Subproblem 2

x + 4 = -4.02492236 Simplifying x + 4 = -4.02492236 Reorder the terms: 4 + x = -4.02492236 Solving 4 + x = -4.02492236 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = -4.02492236 + -4 Combine like terms: 4 + -4 = 0 0 + x = -4.02492236 + -4 x = -4.02492236 + -4 Combine like terms: -4.02492236 + -4 = -8.02492236 x = -8.02492236 Simplifying x = -8.02492236

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.02492236, -8.02492236}

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