15x^2-36x=103

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Solution for 15x^2-36x=103 equation:


Simplifying
15x2 + -36x = 103

Reorder the terms:
-36x + 15x2 = 103

Solving
-36x + 15x2 = 103

Solving for variable 'x'.

Reorder the terms:
-103 + -36x + 15x2 = 103 + -103

Combine like terms: 103 + -103 = 0
-103 + -36x + 15x2 = 0

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

Divide each side by '15'.
-6.866666667 + -2.4x + x2 = 0

Move the constant term to the right:

Add '6.866666667' to each side of the equation.
-6.866666667 + -2.4x + 6.866666667 + x2 = 0 + 6.866666667

Reorder the terms:
-6.866666667 + 6.866666667 + -2.4x + x2 = 0 + 6.866666667

Combine like terms: -6.866666667 + 6.866666667 = 0.000000000
0.000000000 + -2.4x + x2 = 0 + 6.866666667
-2.4x + x2 = 0 + 6.866666667

Combine like terms: 0 + 6.866666667 = 6.866666667
-2.4x + x2 = 6.866666667

The x term is -2.4x.  Take half its coefficient (-1.2).
Square it (1.44) and add it to both sides.

Add '1.44' to each side of the equation.
-2.4x + 1.44 + x2 = 6.866666667 + 1.44

Reorder the terms:
1.44 + -2.4x + x2 = 6.866666667 + 1.44

Combine like terms: 6.866666667 + 1.44 = 8.306666667
1.44 + -2.4x + x2 = 8.306666667

Factor a perfect square on the left side:
(x + -1.2)(x + -1.2) = 8.306666667

Calculate the square root of the right side: 2.882128843

Break this problem into two subproblems by setting 
(x + -1.2) equal to 2.882128843 and -2.882128843.

Subproblem 1

x + -1.2 = 2.882128843 Simplifying x + -1.2 = 2.882128843 Reorder the terms: -1.2 + x = 2.882128843 Solving -1.2 + x = 2.882128843 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.2' to each side of the equation. -1.2 + 1.2 + x = 2.882128843 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + x = 2.882128843 + 1.2 x = 2.882128843 + 1.2 Combine like terms: 2.882128843 + 1.2 = 4.082128843 x = 4.082128843 Simplifying x = 4.082128843

Subproblem 2

x + -1.2 = -2.882128843 Simplifying x + -1.2 = -2.882128843 Reorder the terms: -1.2 + x = -2.882128843 Solving -1.2 + x = -2.882128843 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.2' to each side of the equation. -1.2 + 1.2 + x = -2.882128843 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + x = -2.882128843 + 1.2 x = -2.882128843 + 1.2 Combine like terms: -2.882128843 + 1.2 = -1.682128843 x = -1.682128843 Simplifying x = -1.682128843

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.082128843, -1.682128843}

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