3x^2+2x=-8x+15

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Solution for 3x^2+2x=-8x+15 equation:


Simplifying
3x2 + 2x = -8x + 15

Reorder the terms:
2x + 3x2 = -8x + 15

Reorder the terms:
2x + 3x2 = 15 + -8x

Solving
2x + 3x2 = 15 + -8x

Solving for variable 'x'.

Reorder the terms:
-15 + 2x + 8x + 3x2 = 15 + -8x + -15 + 8x

Combine like terms: 2x + 8x = 10x
-15 + 10x + 3x2 = 15 + -8x + -15 + 8x

Reorder the terms:
-15 + 10x + 3x2 = 15 + -15 + -8x + 8x

Combine like terms: 15 + -15 = 0
-15 + 10x + 3x2 = 0 + -8x + 8x
-15 + 10x + 3x2 = -8x + 8x

Combine like terms: -8x + 8x = 0
-15 + 10x + 3x2 = 0

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

Divide each side by '3'.
-5 + 3.333333333x + x2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + 3.333333333x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + 3.333333333x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + 3.333333333x + x2 = 0 + 5
3.333333333x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
3.333333333x + x2 = 5

The x term is 3.333333333x.  Take half its coefficient (1.666666667).
Square it (2.777777779) and add it to both sides.

Add '2.777777779' to each side of the equation.
3.333333333x + 2.777777779 + x2 = 5 + 2.777777779

Reorder the terms:
2.777777779 + 3.333333333x + x2 = 5 + 2.777777779

Combine like terms: 5 + 2.777777779 = 7.777777779
2.777777779 + 3.333333333x + x2 = 7.777777779

Factor a perfect square on the left side:
(x + 1.666666667)(x + 1.666666667) = 7.777777779

Calculate the square root of the right side: 2.788866755

Break this problem into two subproblems by setting 
(x + 1.666666667) equal to 2.788866755 and -2.788866755.

Subproblem 1

x + 1.666666667 = 2.788866755 Simplifying x + 1.666666667 = 2.788866755 Reorder the terms: 1.666666667 + x = 2.788866755 Solving 1.666666667 + x = 2.788866755 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.666666667' to each side of the equation. 1.666666667 + -1.666666667 + x = 2.788866755 + -1.666666667 Combine like terms: 1.666666667 + -1.666666667 = 0.000000000 0.000000000 + x = 2.788866755 + -1.666666667 x = 2.788866755 + -1.666666667 Combine like terms: 2.788866755 + -1.666666667 = 1.122200088 x = 1.122200088 Simplifying x = 1.122200088

Subproblem 2

x + 1.666666667 = -2.788866755 Simplifying x + 1.666666667 = -2.788866755 Reorder the terms: 1.666666667 + x = -2.788866755 Solving 1.666666667 + x = -2.788866755 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.666666667' to each side of the equation. 1.666666667 + -1.666666667 + x = -2.788866755 + -1.666666667 Combine like terms: 1.666666667 + -1.666666667 = 0.000000000 0.000000000 + x = -2.788866755 + -1.666666667 x = -2.788866755 + -1.666666667 Combine like terms: -2.788866755 + -1.666666667 = -4.455533422 x = -4.455533422 Simplifying x = -4.455533422

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.122200088, -4.455533422}

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