(.33)x^2+(.5)x-12=-7

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Solution for (.33)x^2+(.5)x-12=-7 equation:


Simplifying
(0.33) * x2 + (0.5) * x + -12 = -7

Reorder the terms:
-12 + 0.5x + 0.33x2 = -7

Solving
-12 + 0.5x + 0.33x2 = -7

Solving for variable 'x'.

Reorder the terms:
-12 + 7 + 0.5x + 0.33x2 = -7 + 7

Combine like terms: -12 + 7 = -5
-5 + 0.5x + 0.33x2 = -7 + 7

Combine like terms: -7 + 7 = 0
-5 + 0.5x + 0.33x2 = 0

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

Divide each side by '0.33'.
-15.15151515 + 1.515151515x + x2 = 0

Move the constant term to the right:

Add '15.15151515' to each side of the equation.
-15.15151515 + 1.515151515x + 15.15151515 + x2 = 0 + 15.15151515

Reorder the terms:
-15.15151515 + 15.15151515 + 1.515151515x + x2 = 0 + 15.15151515

Combine like terms: -15.15151515 + 15.15151515 = 0.00000000
0.00000000 + 1.515151515x + x2 = 0 + 15.15151515
1.515151515x + x2 = 0 + 15.15151515

Combine like terms: 0 + 15.15151515 = 15.15151515
1.515151515x + x2 = 15.15151515

The x term is 1.515151515x.  Take half its coefficient (0.7575757575).
Square it (0.5739210284) and add it to both sides.

Add '0.5739210284' to each side of the equation.
1.515151515x + 0.5739210284 + x2 = 15.15151515 + 0.5739210284

Reorder the terms:
0.5739210284 + 1.515151515x + x2 = 15.15151515 + 0.5739210284

Combine like terms: 15.15151515 + 0.5739210284 = 15.7254361784
0.5739210284 + 1.515151515x + x2 = 15.7254361784

Factor a perfect square on the left side:
(x + 0.7575757575)(x + 0.7575757575) = 15.7254361784

Calculate the square root of the right side: 3.965531008

Break this problem into two subproblems by setting 
(x + 0.7575757575) equal to 3.965531008 and -3.965531008.

Subproblem 1

x + 0.7575757575 = 3.965531008 Simplifying x + 0.7575757575 = 3.965531008 Reorder the terms: 0.7575757575 + x = 3.965531008 Solving 0.7575757575 + x = 3.965531008 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.7575757575' to each side of the equation. 0.7575757575 + -0.7575757575 + x = 3.965531008 + -0.7575757575 Combine like terms: 0.7575757575 + -0.7575757575 = 0.0000000000 0.0000000000 + x = 3.965531008 + -0.7575757575 x = 3.965531008 + -0.7575757575 Combine like terms: 3.965531008 + -0.7575757575 = 3.2079552505 x = 3.2079552505 Simplifying x = 3.2079552505

Subproblem 2

x + 0.7575757575 = -3.965531008 Simplifying x + 0.7575757575 = -3.965531008 Reorder the terms: 0.7575757575 + x = -3.965531008 Solving 0.7575757575 + x = -3.965531008 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.7575757575' to each side of the equation. 0.7575757575 + -0.7575757575 + x = -3.965531008 + -0.7575757575 Combine like terms: 0.7575757575 + -0.7575757575 = 0.0000000000 0.0000000000 + x = -3.965531008 + -0.7575757575 x = -3.965531008 + -0.7575757575 Combine like terms: -3.965531008 + -0.7575757575 = -4.7231067655 x = -4.7231067655 Simplifying x = -4.7231067655

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.2079552505, -4.7231067655}

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