6x^2+4.5x-15=0

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Solution for 6x^2+4.5x-15=0 equation:


Simplifying
6x2 + 4.5x + -15 = 0

Reorder the terms:
-15 + 4.5x + 6x2 = 0

Solving
-15 + 4.5x + 6x2 = 0

Solving for variable 'x'.

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

Divide each side by '6'.
-2.5 + 0.75x + x2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + 0.75x + 2.5 + x2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + 0.75x + x2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + 0.75x + x2 = 0 + 2.5
0.75x + x2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
0.75x + x2 = 2.5

The x term is 0.75x.  Take half its coefficient (0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
0.75x + 0.140625 + x2 = 2.5 + 0.140625

Reorder the terms:
0.140625 + 0.75x + x2 = 2.5 + 0.140625

Combine like terms: 2.5 + 0.140625 = 2.640625
0.140625 + 0.75x + x2 = 2.640625

Factor a perfect square on the left side:
(x + 0.375)(x + 0.375) = 2.640625

Calculate the square root of the right side: 1.625

Break this problem into two subproblems by setting 
(x + 0.375) equal to 1.625 and -1.625.

Subproblem 1

x + 0.375 = 1.625 Simplifying x + 0.375 = 1.625 Reorder the terms: 0.375 + x = 1.625 Solving 0.375 + x = 1.625 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + x = 1.625 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = 1.625 + -0.375 x = 1.625 + -0.375 Combine like terms: 1.625 + -0.375 = 1.25 x = 1.25 Simplifying x = 1.25

Subproblem 2

x + 0.375 = -1.625 Simplifying x + 0.375 = -1.625 Reorder the terms: 0.375 + x = -1.625 Solving 0.375 + x = -1.625 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + x = -1.625 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = -1.625 + -0.375 x = -1.625 + -0.375 Combine like terms: -1.625 + -0.375 = -2 x = -2 Simplifying x = -2

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.25, -2}

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