3x(3+x)=15+x

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Solution for 3x(3+x)=15+x equation:


Simplifying
3x(3 + x) = 15 + x
(3 * 3x + x * 3x) = 15 + x
(9x + 3x2) = 15 + x

Solving
9x + 3x2 = 15 + x

Solving for variable 'x'.

Reorder the terms:
-15 + 9x + -1x + 3x2 = 15 + x + -15 + -1x

Combine like terms: 9x + -1x = 8x
-15 + 8x + 3x2 = 15 + x + -15 + -1x

Reorder the terms:
-15 + 8x + 3x2 = 15 + -15 + x + -1x

Combine like terms: 15 + -15 = 0
-15 + 8x + 3x2 = 0 + x + -1x
-15 + 8x + 3x2 = x + -1x

Combine like terms: x + -1x = 0
-15 + 8x + 3x2 = 0

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

Divide each side by '3'.
-5 + 2.666666667x + x2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + 2.666666667x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + 2.666666667x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + 2.666666667x + x2 = 0 + 5
2.666666667x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
2.666666667x + x2 = 5

The x term is 2.666666667x.  Take half its coefficient (1.333333334).
Square it (1.777777780) and add it to both sides.

Add '1.777777780' to each side of the equation.
2.666666667x + 1.777777780 + x2 = 5 + 1.777777780

Reorder the terms:
1.777777780 + 2.666666667x + x2 = 5 + 1.777777780

Combine like terms: 5 + 1.777777780 = 6.77777778
1.777777780 + 2.666666667x + x2 = 6.77777778

Factor a perfect square on the left side:
(x + 1.333333334)(x + 1.333333334) = 6.77777778

Calculate the square root of the right side: 2.603416559

Break this problem into two subproblems by setting 
(x + 1.333333334) equal to 2.603416559 and -2.603416559.

Subproblem 1

x + 1.333333334 = 2.603416559 Simplifying x + 1.333333334 = 2.603416559 Reorder the terms: 1.333333334 + x = 2.603416559 Solving 1.333333334 + x = 2.603416559 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + x = 2.603416559 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = 2.603416559 + -1.333333334 x = 2.603416559 + -1.333333334 Combine like terms: 2.603416559 + -1.333333334 = 1.270083225 x = 1.270083225 Simplifying x = 1.270083225

Subproblem 2

x + 1.333333334 = -2.603416559 Simplifying x + 1.333333334 = -2.603416559 Reorder the terms: 1.333333334 + x = -2.603416559 Solving 1.333333334 + x = -2.603416559 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + x = -2.603416559 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = -2.603416559 + -1.333333334 x = -2.603416559 + -1.333333334 Combine like terms: -2.603416559 + -1.333333334 = -3.936749893 x = -3.936749893 Simplifying x = -3.936749893

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.270083225, -3.936749893}

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