5x^2-15x+2.16=

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Solution for 5x^2-15x+2.16= equation:


Simplifying
5x2 + -15x + 2.16 = 0

Reorder the terms:
2.16 + -15x + 5x2 = 0

Solving
2.16 + -15x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
0.432 + -3x + x2 = 0

Move the constant term to the right:

Add '-0.432' to each side of the equation.
0.432 + -3x + -0.432 + x2 = 0 + -0.432

Reorder the terms:
0.432 + -0.432 + -3x + x2 = 0 + -0.432

Combine like terms: 0.432 + -0.432 = 0.000
0.000 + -3x + x2 = 0 + -0.432
-3x + x2 = 0 + -0.432

Combine like terms: 0 + -0.432 = -0.432
-3x + x2 = -0.432

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 = -0.432 + 2.25

Reorder the terms:
2.25 + -3x + x2 = -0.432 + 2.25

Combine like terms: -0.432 + 2.25 = 1.818
2.25 + -3x + x2 = 1.818

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 1.818

Calculate the square root of the right side: 1.348332303

Break this problem into two subproblems by setting 
(x + -1.5) equal to 1.348332303 and -1.348332303.

Subproblem 1

x + -1.5 = 1.348332303 Simplifying x + -1.5 = 1.348332303 Reorder the terms: -1.5 + x = 1.348332303 Solving -1.5 + x = 1.348332303 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 = 1.348332303 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 1.348332303 + 1.5 x = 1.348332303 + 1.5 Combine like terms: 1.348332303 + 1.5 = 2.848332303 x = 2.848332303 Simplifying x = 2.848332303

Subproblem 2

x + -1.5 = -1.348332303 Simplifying x + -1.5 = -1.348332303 Reorder the terms: -1.5 + x = -1.348332303 Solving -1.5 + x = -1.348332303 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 = -1.348332303 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -1.348332303 + 1.5 x = -1.348332303 + 1.5 Combine like terms: -1.348332303 + 1.5 = 0.151667697 x = 0.151667697 Simplifying x = 0.151667697

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.848332303, 0.151667697}

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