.25x^2+1.5x-6.75=0

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Solution for .25x^2+1.5x-6.75=0 equation:


Simplifying
0.25x2 + 1.5x + -6.75 = 0

Reorder the terms:
-6.75 + 1.5x + 0.25x2 = 0

Solving
-6.75 + 1.5x + 0.25x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.25'.
-27 + 6x + x2 = 0

Move the constant term to the right:

Add '27' to each side of the equation.
-27 + 6x + 27 + x2 = 0 + 27

Reorder the terms:
-27 + 27 + 6x + x2 = 0 + 27

Combine like terms: -27 + 27 = 0
0 + 6x + x2 = 0 + 27
6x + x2 = 0 + 27

Combine like terms: 0 + 27 = 27
6x + x2 = 27

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 27 + 9

Reorder the terms:
9 + 6x + x2 = 27 + 9

Combine like terms: 27 + 9 = 36
9 + 6x + x2 = 36

Factor a perfect square on the left side:
(x + 3)(x + 3) = 36

Calculate the square root of the right side: 6

Break this problem into two subproblems by setting 
(x + 3) equal to 6 and -6.

Subproblem 1

x + 3 = 6 Simplifying x + 3 = 6 Reorder the terms: 3 + x = 6 Solving 3 + x = 6 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 6 + -3 Combine like terms: 3 + -3 = 0 0 + x = 6 + -3 x = 6 + -3 Combine like terms: 6 + -3 = 3 x = 3 Simplifying x = 3

Subproblem 2

x + 3 = -6 Simplifying x + 3 = -6 Reorder the terms: 3 + x = -6 Solving 3 + x = -6 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -6 + -3 Combine like terms: 3 + -3 = 0 0 + x = -6 + -3 x = -6 + -3 Combine like terms: -6 + -3 = -9 x = -9 Simplifying x = -9

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3, -9}

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