3x(5x+10)=12+x

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Solution for 3x(5x+10)=12+x equation:


Simplifying
3x(5x + 10) = 12 + x

Reorder the terms:
3x(10 + 5x) = 12 + x
(10 * 3x + 5x * 3x) = 12 + x
(30x + 15x2) = 12 + x

Solving
30x + 15x2 = 12 + x

Solving for variable 'x'.

Reorder the terms:
-12 + 30x + -1x + 15x2 = 12 + x + -12 + -1x

Combine like terms: 30x + -1x = 29x
-12 + 29x + 15x2 = 12 + x + -12 + -1x

Reorder the terms:
-12 + 29x + 15x2 = 12 + -12 + x + -1x

Combine like terms: 12 + -12 = 0
-12 + 29x + 15x2 = 0 + x + -1x
-12 + 29x + 15x2 = x + -1x

Combine like terms: x + -1x = 0
-12 + 29x + 15x2 = 0

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

Divide each side by '15'.
-0.8 + 1.933333333x + x2 = 0

Move the constant term to the right:

Add '0.8' to each side of the equation.
-0.8 + 1.933333333x + 0.8 + x2 = 0 + 0.8

Reorder the terms:
-0.8 + 0.8 + 1.933333333x + x2 = 0 + 0.8

Combine like terms: -0.8 + 0.8 = 0.0
0.0 + 1.933333333x + x2 = 0 + 0.8
1.933333333x + x2 = 0 + 0.8

Combine like terms: 0 + 0.8 = 0.8
1.933333333x + x2 = 0.8

The x term is 1.933333333x.  Take half its coefficient (0.9666666665).
Square it (0.9344444441) and add it to both sides.

Add '0.9344444441' to each side of the equation.
1.933333333x + 0.9344444441 + x2 = 0.8 + 0.9344444441

Reorder the terms:
0.9344444441 + 1.933333333x + x2 = 0.8 + 0.9344444441

Combine like terms: 0.8 + 0.9344444441 = 1.7344444441
0.9344444441 + 1.933333333x + x2 = 1.7344444441

Factor a perfect square on the left side:
(x + 0.9666666665)(x + 0.9666666665) = 1.7344444441

Calculate the square root of the right side: 1.316983084

Break this problem into two subproblems by setting 
(x + 0.9666666665) equal to 1.316983084 and -1.316983084.

Subproblem 1

x + 0.9666666665 = 1.316983084 Simplifying x + 0.9666666665 = 1.316983084 Reorder the terms: 0.9666666665 + x = 1.316983084 Solving 0.9666666665 + x = 1.316983084 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.9666666665' to each side of the equation. 0.9666666665 + -0.9666666665 + x = 1.316983084 + -0.9666666665 Combine like terms: 0.9666666665 + -0.9666666665 = 0.0000000000 0.0000000000 + x = 1.316983084 + -0.9666666665 x = 1.316983084 + -0.9666666665 Combine like terms: 1.316983084 + -0.9666666665 = 0.3503164175 x = 0.3503164175 Simplifying x = 0.3503164175

Subproblem 2

x + 0.9666666665 = -1.316983084 Simplifying x + 0.9666666665 = -1.316983084 Reorder the terms: 0.9666666665 + x = -1.316983084 Solving 0.9666666665 + x = -1.316983084 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.9666666665' to each side of the equation. 0.9666666665 + -0.9666666665 + x = -1.316983084 + -0.9666666665 Combine like terms: 0.9666666665 + -0.9666666665 = 0.0000000000 0.0000000000 + x = -1.316983084 + -0.9666666665 x = -1.316983084 + -0.9666666665 Combine like terms: -1.316983084 + -0.9666666665 = -2.2836497505 x = -2.2836497505 Simplifying x = -2.2836497505

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.3503164175, -2.2836497505}

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