3x^2+7x-8=-4+12

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Solution for 3x^2+7x-8=-4+12 equation: 


Simplifying
3x2 + 7x + -8 = -4 + 12

Reorder the terms:
-8 + 7x + 3x2 = -4 + 12

Combine like terms: -4 + 12 = 8
-8 + 7x + 3x2 = 8

Solving
-8 + 7x + 3x2 = 8

Solving for variable 'x'.

Reorder the terms:
-8 + -8 + 7x + 3x2 = 8 + -8

Combine like terms: -8 + -8 = -16
-16 + 7x + 3x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-16 + 7x + 3x2 = 0

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

Divide each side by '3'.
-5.333333333 + 2.333333333x + x2 = 0

Move the constant term to the right:

Add '5.333333333' to each side of the equation.
-5.333333333 + 2.333333333x + 5.333333333 + x2 = 0 + 5.333333333

Reorder the terms:
-5.333333333 + 5.333333333 + 2.333333333x + x2 = 0 + 5.333333333

Combine like terms: -5.333333333 + 5.333333333 = 0.000000000
0.000000000 + 2.333333333x + x2 = 0 + 5.333333333
2.333333333x + x2 = 0 + 5.333333333

Combine like terms: 0 + 5.333333333 = 5.333333333
2.333333333x + x2 = 5.333333333

The x term is 2.333333333x.  Take half its coefficient (1.166666667).
Square it (1.361111112) and add it to both sides.

Add '1.361111112' to each side of the equation.
2.333333333x + 1.361111112 + x2 = 5.333333333 + 1.361111112

Reorder the terms:
1.361111112 + 2.333333333x + x2 = 5.333333333 + 1.361111112

Combine like terms: 5.333333333 + 1.361111112 = 6.694444445
1.361111112 + 2.333333333x + x2 = 6.694444445

Factor a perfect square on the left side:
(x + 1.166666667)(x + 1.166666667) = 6.694444445

Calculate the square root of the right side: 2.587362449

Break this problem into two subproblems by setting 
(x + 1.166666667) equal to 2.587362449 and -2.587362449.


Subproblem 1
x + 1.166666667 = 2.587362449

Simplifying
x + 1.166666667 = 2.587362449

Reorder the terms:
1.166666667 + x = 2.587362449

Solving
1.166666667 + x = 2.587362449

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-1.166666667' to each side of the equation.
1.166666667 + -1.166666667 + x = 2.587362449 + -1.166666667

Combine like terms: 1.166666667 + -1.166666667 = 0.000000000
0.000000000 + x = 2.587362449 + -1.166666667
x = 2.587362449 + -1.166666667

Combine like terms: 2.587362449 + -1.166666667 = 1.420695782
x = 1.420695782

Simplifying
x = 1.420695782


Subproblem 2
x + 1.166666667 = -2.587362449

Simplifying
x + 1.166666667 = -2.587362449

Reorder the terms:
1.166666667 + x = -2.587362449

Solving
1.166666667 + x = -2.587362449

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-1.166666667' to each side of the equation.
1.166666667 + -1.166666667 + x = -2.587362449 + -1.166666667

Combine like terms: 1.166666667 + -1.166666667 = 0.000000000
0.000000000 + x = -2.587362449 + -1.166666667
x = -2.587362449 + -1.166666667

Combine like terms: -2.587362449 + -1.166666667 = -3.754029116
x = -3.754029116

Simplifying
x = -3.754029116


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {1.420695782, -3.754029116}

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