(0.6x-1.28)(18x+8)=

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Solution for (0.6x-1.28)(18x+8)= equation:


Simplifying
(0.6x + -1.28)(18x + 8) = 0

Reorder the terms:
(-1.28 + 0.6x)(18x + 8) = 0

Reorder the terms:
(-1.28 + 0.6x)(8 + 18x) = 0

Multiply (-1.28 + 0.6x) * (8 + 18x)
(-1.28(8 + 18x) + 0.6x * (8 + 18x)) = 0
((8 * -1.28 + 18x * -1.28) + 0.6x * (8 + 18x)) = 0
((-10.24 + -23.04x) + 0.6x * (8 + 18x)) = 0
(-10.24 + -23.04x + (8 * 0.6x + 18x * 0.6x)) = 0
(-10.24 + -23.04x + (4.8x + 10.8x2)) = 0

Combine like terms: -23.04x + 4.8x = -18.24x
(-10.24 + -18.24x + 10.8x2) = 0

Solving
-10.24 + -18.24x + 10.8x2 = 0

Solving for variable 'x'.

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

Divide each side by '10.8'.
-0.9481481481 + -1.688888889x + x2 = 0

Move the constant term to the right:

Add '0.9481481481' to each side of the equation.
-0.9481481481 + -1.688888889x + 0.9481481481 + x2 = 0 + 0.9481481481

Reorder the terms:
-0.9481481481 + 0.9481481481 + -1.688888889x + x2 = 0 + 0.9481481481

Combine like terms: -0.9481481481 + 0.9481481481 = 0.0000000000
0.0000000000 + -1.688888889x + x2 = 0 + 0.9481481481
-1.688888889x + x2 = 0 + 0.9481481481

Combine like terms: 0 + 0.9481481481 = 0.9481481481
-1.688888889x + x2 = 0.9481481481

The x term is -1.688888889x.  Take half its coefficient (-0.8444444445).
Square it (0.7130864198) and add it to both sides.

Add '0.7130864198' to each side of the equation.
-1.688888889x + 0.7130864198 + x2 = 0.9481481481 + 0.7130864198

Reorder the terms:
0.7130864198 + -1.688888889x + x2 = 0.9481481481 + 0.7130864198

Combine like terms: 0.9481481481 + 0.7130864198 = 1.6612345679
0.7130864198 + -1.688888889x + x2 = 1.6612345679

Factor a perfect square on the left side:
(x + -0.8444444445)(x + -0.8444444445) = 1.6612345679

Calculate the square root of the right side: 1.288888889

Break this problem into two subproblems by setting 
(x + -0.8444444445) equal to 1.288888889 and -1.288888889.

Subproblem 1

x + -0.8444444445 = 1.288888889 Simplifying x + -0.8444444445 = 1.288888889 Reorder the terms: -0.8444444445 + x = 1.288888889 Solving -0.8444444445 + x = 1.288888889 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8444444445' to each side of the equation. -0.8444444445 + 0.8444444445 + x = 1.288888889 + 0.8444444445 Combine like terms: -0.8444444445 + 0.8444444445 = 0.0000000000 0.0000000000 + x = 1.288888889 + 0.8444444445 x = 1.288888889 + 0.8444444445 Combine like terms: 1.288888889 + 0.8444444445 = 2.1333333335 x = 2.1333333335 Simplifying x = 2.1333333335

Subproblem 2

x + -0.8444444445 = -1.288888889 Simplifying x + -0.8444444445 = -1.288888889 Reorder the terms: -0.8444444445 + x = -1.288888889 Solving -0.8444444445 + x = -1.288888889 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8444444445' to each side of the equation. -0.8444444445 + 0.8444444445 + x = -1.288888889 + 0.8444444445 Combine like terms: -0.8444444445 + 0.8444444445 = 0.0000000000 0.0000000000 + x = -1.288888889 + 0.8444444445 x = -1.288888889 + 0.8444444445 Combine like terms: -1.288888889 + 0.8444444445 = -0.4444444445 x = -0.4444444445 Simplifying x = -0.4444444445

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.1333333335, -0.4444444445}

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