x^2+3x-6.75=0

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Solution for x^2+3x-6.75=0 equation: 


Simplifying
x2 + 3x + -6.75 = 0

Reorder the terms:
-6.75 + 3x + x2 = 0

Solving
-6.75 + 3x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '6.75' to each side of the equation.
-6.75 + 3x + 6.75 + x2 = 0 + 6.75

Reorder the terms:
-6.75 + 6.75 + 3x + x2 = 0 + 6.75

Combine like terms: -6.75 + 6.75 = 0.00
0.00 + 3x + x2 = 0 + 6.75
3x + x2 = 0 + 6.75

Combine like terms: 0 + 6.75 = 6.75
3x + x2 = 6.75

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 6.75 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 6.75 + 2.25

Combine like terms: 6.75 + 2.25 = 9
2.25 + 3x + x2 = 9

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 9

Calculate the square root of the right side: 3

Break this problem into two subproblems by setting 
(x + 1.5) equal to 3 and -3.


Subproblem 1
x + 1.5 = 3

Simplifying
x + 1.5 = 3

Reorder the terms:
1.5 + x = 3

Solving
1.5 + x = 3

Solving for variable 'x'.

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

Add '-1.5' to each side of the equation.
1.5 + -1.5 + x = 3 + -1.5

Combine like terms: 1.5 + -1.5 = 0.0
0.0 + x = 3 + -1.5
x = 3 + -1.5

Combine like terms: 3 + -1.5 = 1.5
x = 1.5

Simplifying
x = 1.5


Subproblem 2
x + 1.5 = -3

Simplifying
x + 1.5 = -3

Reorder the terms:
1.5 + x = -3

Solving
1.5 + x = -3

Solving for variable 'x'.

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

Add '-1.5' to each side of the equation.
1.5 + -1.5 + x = -3 + -1.5

Combine like terms: 1.5 + -1.5 = 0.0
0.0 + x = -3 + -1.5
x = -3 + -1.5

Combine like terms: -3 + -1.5 = -4.5
x = -4.5

Simplifying
x = -4.5


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {1.5, -4.5}

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