5x^2-9=6x

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Solution for 5x^2-9=6x equation:


Simplifying
5x2 + -9 = 6x

Reorder the terms:
-9 + 5x2 = 6x

Solving
-9 + 5x2 = 6x

Solving for variable 'x'.

Reorder the terms:
-9 + -6x + 5x2 = 6x + -6x

Combine like terms: 6x + -6x = 0
-9 + -6x + 5x2 = 0

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

Divide each side by '5'.
-1.8 + -1.2x + x2 = 0

Move the constant term to the right:

Add '1.8' to each side of the equation.
-1.8 + -1.2x + 1.8 + x2 = 0 + 1.8

Reorder the terms:
-1.8 + 1.8 + -1.2x + x2 = 0 + 1.8

Combine like terms: -1.8 + 1.8 = 0.0
0.0 + -1.2x + x2 = 0 + 1.8
-1.2x + x2 = 0 + 1.8

Combine like terms: 0 + 1.8 = 1.8
-1.2x + x2 = 1.8

The x term is -1.2x.  Take half its coefficient (-0.6).
Square it (0.36) and add it to both sides.

Add '0.36' to each side of the equation.
-1.2x + 0.36 + x2 = 1.8 + 0.36

Reorder the terms:
0.36 + -1.2x + x2 = 1.8 + 0.36

Combine like terms: 1.8 + 0.36 = 2.16
0.36 + -1.2x + x2 = 2.16

Factor a perfect square on the left side:
(x + -0.6)(x + -0.6) = 2.16

Calculate the square root of the right side: 1.469693846

Break this problem into two subproblems by setting 
(x + -0.6) equal to 1.469693846 and -1.469693846.

Subproblem 1

x + -0.6 = 1.469693846 Simplifying x + -0.6 = 1.469693846 Reorder the terms: -0.6 + x = 1.469693846 Solving -0.6 + x = 1.469693846 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6' to each side of the equation. -0.6 + 0.6 + x = 1.469693846 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + x = 1.469693846 + 0.6 x = 1.469693846 + 0.6 Combine like terms: 1.469693846 + 0.6 = 2.069693846 x = 2.069693846 Simplifying x = 2.069693846

Subproblem 2

x + -0.6 = -1.469693846 Simplifying x + -0.6 = -1.469693846 Reorder the terms: -0.6 + x = -1.469693846 Solving -0.6 + x = -1.469693846 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6' to each side of the equation. -0.6 + 0.6 + x = -1.469693846 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + x = -1.469693846 + 0.6 x = -1.469693846 + 0.6 Combine like terms: -1.469693846 + 0.6 = -0.869693846 x = -0.869693846 Simplifying x = -0.869693846

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.069693846, -0.869693846}

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