(8x^2-2x+16)+(2x^2+8x-73)=

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Solution for (8x^2-2x+16)+(2x^2+8x-73)= equation:


Simplifying
(8x2 + -2x + 16) + (2x2 + 8x + -73) = 0

Reorder the terms:
(16 + -2x + 8x2) + (2x2 + 8x + -73) = 0

Remove parenthesis around (16 + -2x + 8x2)
16 + -2x + 8x2 + (2x2 + 8x + -73) = 0

Reorder the terms:
16 + -2x + 8x2 + (-73 + 8x + 2x2) = 0

Remove parenthesis around (-73 + 8x + 2x2)
16 + -2x + 8x2 + -73 + 8x + 2x2 = 0

Reorder the terms:
16 + -73 + -2x + 8x + 8x2 + 2x2 = 0

Combine like terms: 16 + -73 = -57
-57 + -2x + 8x + 8x2 + 2x2 = 0

Combine like terms: -2x + 8x = 6x
-57 + 6x + 8x2 + 2x2 = 0

Combine like terms: 8x2 + 2x2 = 10x2
-57 + 6x + 10x2 = 0

Solving
-57 + 6x + 10x2 = 0

Solving for variable 'x'.

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

Divide each side by '10'.
-5.7 + 0.6x + x2 = 0.0

Move the constant term to the right:

Add '5.7' to each side of the equation.
-5.7 + 0.6x + 5.7 + x2 = 0.0 + 5.7

Reorder the terms:
-5.7 + 5.7 + 0.6x + x2 = 0.0 + 5.7

Combine like terms: -5.7 + 5.7 = 0.0
0.0 + 0.6x + x2 = 0.0 + 5.7
0.6x + x2 = 0.0 + 5.7

Combine like terms: 0.0 + 5.7 = 5.7
0.6x + x2 = 5.7

The x term is 0.6x.  Take half its coefficient (0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
0.6x + 0.09 + x2 = 5.7 + 0.09

Reorder the terms:
0.09 + 0.6x + x2 = 5.7 + 0.09

Combine like terms: 5.7 + 0.09 = 5.79
0.09 + 0.6x + x2 = 5.79

Factor a perfect square on the left side:
(x + 0.3)(x + 0.3) = 5.79

Calculate the square root of the right side: 2.406241883

Break this problem into two subproblems by setting 
(x + 0.3) equal to 2.406241883 and -2.406241883.

Subproblem 1

x + 0.3 = 2.406241883 Simplifying x + 0.3 = 2.406241883 Reorder the terms: 0.3 + x = 2.406241883 Solving 0.3 + x = 2.406241883 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = 2.406241883 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = 2.406241883 + -0.3 x = 2.406241883 + -0.3 Combine like terms: 2.406241883 + -0.3 = 2.106241883 x = 2.106241883 Simplifying x = 2.106241883

Subproblem 2

x + 0.3 = -2.406241883 Simplifying x + 0.3 = -2.406241883 Reorder the terms: 0.3 + x = -2.406241883 Solving 0.3 + x = -2.406241883 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = -2.406241883 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = -2.406241883 + -0.3 x = -2.406241883 + -0.3 Combine like terms: -2.406241883 + -0.3 = -2.706241883 x = -2.706241883 Simplifying x = -2.706241883

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.106241883, -2.706241883}

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