7(3-x)2x=-9

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Solution for 7(3-x)2x=-9 equation:


Simplifying
7(3 + -1x) * 2x = -9

Reorder the terms for easier multiplication:
7 * 2x(3 + -1x) = -9

Multiply 7 * 2
14x(3 + -1x) = -9
(3 * 14x + -1x * 14x) = -9
(42x + -14x2) = -9

Solving
42x + -14x2 = -9

Solving for variable 'x'.

Reorder the terms:
9 + 42x + -14x2 = -9 + 9

Combine like terms: -9 + 9 = 0
9 + 42x + -14x2 = 0

Begin completing the square.  Divide all terms by
-14 the coefficient of the squared term: 

Divide each side by '-14'.
-0.6428571429 + -3x + x2 = 0

Move the constant term to the right:

Add '0.6428571429' to each side of the equation.
-0.6428571429 + -3x + 0.6428571429 + x2 = 0 + 0.6428571429

Reorder the terms:
-0.6428571429 + 0.6428571429 + -3x + x2 = 0 + 0.6428571429

Combine like terms: -0.6428571429 + 0.6428571429 = 0.0000000000
0.0000000000 + -3x + x2 = 0 + 0.6428571429
-3x + x2 = 0 + 0.6428571429

Combine like terms: 0 + 0.6428571429 = 0.6428571429
-3x + x2 = 0.6428571429

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 0.6428571429 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 0.6428571429 + 2.25

Combine like terms: 0.6428571429 + 2.25 = 2.8928571429
2.25 + -3x + x2 = 2.8928571429

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 2.8928571429

Calculate the square root of the right side: 1.700840129

Break this problem into two subproblems by setting 
(x + -1.5) equal to 1.700840129 and -1.700840129.

Subproblem 1

x + -1.5 = 1.700840129 Simplifying x + -1.5 = 1.700840129 Reorder the terms: -1.5 + x = 1.700840129 Solving -1.5 + x = 1.700840129 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 1.700840129 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 1.700840129 + 1.5 x = 1.700840129 + 1.5 Combine like terms: 1.700840129 + 1.5 = 3.200840129 x = 3.200840129 Simplifying x = 3.200840129

Subproblem 2

x + -1.5 = -1.700840129 Simplifying x + -1.5 = -1.700840129 Reorder the terms: -1.5 + x = -1.700840129 Solving -1.5 + x = -1.700840129 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -1.700840129 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -1.700840129 + 1.5 x = -1.700840129 + 1.5 Combine like terms: -1.700840129 + 1.5 = -0.200840129 x = -0.200840129 Simplifying x = -0.200840129

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.200840129, -0.200840129}

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