x^2+8x+16=2x^2-14

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Solution for x^2+8x+16=2x^2-14 equation:


Simplifying
x2 + 8x + 16 = 2x2 + -14

Reorder the terms:
16 + 8x + x2 = 2x2 + -14

Reorder the terms:
16 + 8x + x2 = -14 + 2x2

Solving
16 + 8x + x2 = -14 + 2x2

Solving for variable 'x'.

Reorder the terms:
16 + 14 + 8x + x2 + -2x2 = -14 + 2x2 + 14 + -2x2

Combine like terms: 16 + 14 = 30
30 + 8x + x2 + -2x2 = -14 + 2x2 + 14 + -2x2

Combine like terms: x2 + -2x2 = -1x2
30 + 8x + -1x2 = -14 + 2x2 + 14 + -2x2

Reorder the terms:
30 + 8x + -1x2 = -14 + 14 + 2x2 + -2x2

Combine like terms: -14 + 14 = 0
30 + 8x + -1x2 = 0 + 2x2 + -2x2
30 + 8x + -1x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
30 + 8x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-30 + -8x + x2 = 0

Move the constant term to the right:

Add '30' to each side of the equation.
-30 + -8x + 30 + x2 = 0 + 30

Reorder the terms:
-30 + 30 + -8x + x2 = 0 + 30

Combine like terms: -30 + 30 = 0
0 + -8x + x2 = 0 + 30
-8x + x2 = 0 + 30

Combine like terms: 0 + 30 = 30
-8x + x2 = 30

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 = 30 + 16

Reorder the terms:
16 + -8x + x2 = 30 + 16

Combine like terms: 30 + 16 = 46
16 + -8x + x2 = 46

Factor a perfect square on the left side:
(x + -4)(x + -4) = 46

Calculate the square root of the right side: 6.782329983

Break this problem into two subproblems by setting 
(x + -4) equal to 6.782329983 and -6.782329983.

Subproblem 1

x + -4 = 6.782329983 Simplifying x + -4 = 6.782329983 Reorder the terms: -4 + x = 6.782329983 Solving -4 + x = 6.782329983 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 = 6.782329983 + 4 Combine like terms: -4 + 4 = 0 0 + x = 6.782329983 + 4 x = 6.782329983 + 4 Combine like terms: 6.782329983 + 4 = 10.782329983 x = 10.782329983 Simplifying x = 10.782329983

Subproblem 2

x + -4 = -6.782329983 Simplifying x + -4 = -6.782329983 Reorder the terms: -4 + x = -6.782329983 Solving -4 + x = -6.782329983 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 = -6.782329983 + 4 Combine like terms: -4 + 4 = 0 0 + x = -6.782329983 + 4 x = -6.782329983 + 4 Combine like terms: -6.782329983 + 4 = -2.782329983 x = -2.782329983 Simplifying x = -2.782329983

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.782329983, -2.782329983}

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