.6(x+8)(x+8)-66=0

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Solution for .6(x+8)(x+8)-66=0 equation:


Simplifying
0.6(x + 8)(x + 8) + -66 = 0

Reorder the terms:
0.6(8 + x)(x + 8) + -66 = 0

Reorder the terms:
0.6(8 + x)(8 + x) + -66 = 0

Multiply (8 + x) * (8 + x)
0.6(8(8 + x) + x(8 + x)) + -66 = 0
0.6((8 * 8 + x * 8) + x(8 + x)) + -66 = 0
0.6((64 + 8x) + x(8 + x)) + -66 = 0
0.6(64 + 8x + (8 * x + x * x)) + -66 = 0
0.6(64 + 8x + (8x + x2)) + -66 = 0

Combine like terms: 8x + 8x = 16x
0.6(64 + 16x + x2) + -66 = 0
(64 * 0.6 + 16x * 0.6 + x2 * 0.6) + -66 = 0
(38.4 + 9.6x + 0.6x2) + -66 = 0

Reorder the terms:
38.4 + -66 + 9.6x + 0.6x2 = 0

Combine like terms: 38.4 + -66 = -27.6
-27.6 + 9.6x + 0.6x2 = 0

Solving
-27.6 + 9.6x + 0.6x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.6'.
-46 + 16x + x2 = 0

Move the constant term to the right:

Add '46' to each side of the equation.
-46 + 16x + 46 + x2 = 0 + 46

Reorder the terms:
-46 + 46 + 16x + x2 = 0 + 46

Combine like terms: -46 + 46 = 0
0 + 16x + x2 = 0 + 46
16x + x2 = 0 + 46

Combine like terms: 0 + 46 = 46
16x + x2 = 46

The x term is 16x.  Take half its coefficient (8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
16x + 64 + x2 = 46 + 64

Reorder the terms:
64 + 16x + x2 = 46 + 64

Combine like terms: 46 + 64 = 110
64 + 16x + x2 = 110

Factor a perfect square on the left side:
(x + 8)(x + 8) = 110

Calculate the square root of the right side: 10.488088482

Break this problem into two subproblems by setting 
(x + 8) equal to 10.488088482 and -10.488088482.

Subproblem 1

x + 8 = 10.488088482 Simplifying x + 8 = 10.488088482 Reorder the terms: 8 + x = 10.488088482 Solving 8 + x = 10.488088482 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = 10.488088482 + -8 Combine like terms: 8 + -8 = 0 0 + x = 10.488088482 + -8 x = 10.488088482 + -8 Combine like terms: 10.488088482 + -8 = 2.488088482 x = 2.488088482 Simplifying x = 2.488088482

Subproblem 2

x + 8 = -10.488088482 Simplifying x + 8 = -10.488088482 Reorder the terms: 8 + x = -10.488088482 Solving 8 + x = -10.488088482 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = -10.488088482 + -8 Combine like terms: 8 + -8 = 0 0 + x = -10.488088482 + -8 x = -10.488088482 + -8 Combine like terms: -10.488088482 + -8 = -18.488088482 x = -18.488088482 Simplifying x = -18.488088482

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.488088482, -18.488088482}

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