(0.7x+3)(6x-0.6)=

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Solution for (0.7x+3)(6x-0.6)= equation:


Simplifying
(0.7x + 3)(6x + -0.6) = 0

Reorder the terms:
(3 + 0.7x)(6x + -0.6) = 0

Reorder the terms:
(3 + 0.7x)(-0.6 + 6x) = 0

Multiply (3 + 0.7x) * (-0.6 + 6x)
(3(-0.6 + 6x) + 0.7x * (-0.6 + 6x)) = 0
((-0.6 * 3 + 6x * 3) + 0.7x * (-0.6 + 6x)) = 0
((-1.8 + 18x) + 0.7x * (-0.6 + 6x)) = 0
(-1.8 + 18x + (-0.6 * 0.7x + 6x * 0.7x)) = 0
(-1.8 + 18x + (-0.42x + 4.2x2)) = 0

Combine like terms: 18x + -0.42x = 17.58x
(-1.8 + 17.58x + 4.2x2) = 0

Solving
-1.8 + 17.58x + 4.2x2 = 0

Solving for variable 'x'.

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

Divide each side by '4.2'.
-0.4285714286 + 4.185714286x + x2 = 0

Move the constant term to the right:

Add '0.4285714286' to each side of the equation.
-0.4285714286 + 4.185714286x + 0.4285714286 + x2 = 0 + 0.4285714286

Reorder the terms:
-0.4285714286 + 0.4285714286 + 4.185714286x + x2 = 0 + 0.4285714286

Combine like terms: -0.4285714286 + 0.4285714286 = 0.0000000000
0.0000000000 + 4.185714286x + x2 = 0 + 0.4285714286
4.185714286x + x2 = 0 + 0.4285714286

Combine like terms: 0 + 0.4285714286 = 0.4285714286
4.185714286x + x2 = 0.4285714286

The x term is 4.185714286x.  Take half its coefficient (2.092857143).
Square it (4.380051021) and add it to both sides.

Add '4.380051021' to each side of the equation.
4.185714286x + 4.380051021 + x2 = 0.4285714286 + 4.380051021

Reorder the terms:
4.380051021 + 4.185714286x + x2 = 0.4285714286 + 4.380051021

Combine like terms: 0.4285714286 + 4.380051021 = 4.8086224496
4.380051021 + 4.185714286x + x2 = 4.8086224496

Factor a perfect square on the left side:
(x + 2.092857143)(x + 2.092857143) = 4.8086224496

Calculate the square root of the right side: 2.192857143

Break this problem into two subproblems by setting 
(x + 2.092857143) equal to 2.192857143 and -2.192857143.

Subproblem 1

x + 2.092857143 = 2.192857143 Simplifying x + 2.092857143 = 2.192857143 Reorder the terms: 2.092857143 + x = 2.192857143 Solving 2.092857143 + x = 2.192857143 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.092857143' to each side of the equation. 2.092857143 + -2.092857143 + x = 2.192857143 + -2.092857143 Combine like terms: 2.092857143 + -2.092857143 = 0.000000000 0.000000000 + x = 2.192857143 + -2.092857143 x = 2.192857143 + -2.092857143 Combine like terms: 2.192857143 + -2.092857143 = 0.1 x = 0.1 Simplifying x = 0.1

Subproblem 2

x + 2.092857143 = -2.192857143 Simplifying x + 2.092857143 = -2.192857143 Reorder the terms: 2.092857143 + x = -2.192857143 Solving 2.092857143 + x = -2.192857143 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.092857143' to each side of the equation. 2.092857143 + -2.092857143 + x = -2.192857143 + -2.092857143 Combine like terms: 2.092857143 + -2.092857143 = 0.000000000 0.000000000 + x = -2.192857143 + -2.092857143 x = -2.192857143 + -2.092857143 Combine like terms: -2.192857143 + -2.092857143 = -4.285714286 x = -4.285714286 Simplifying x = -4.285714286

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.1, -4.285714286}

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