3x^2-3=4.5x

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Solution for 3x^2-3=4.5x equation:


Simplifying
3x2 + -3 = 4.5x

Reorder the terms:
-3 + 3x2 = 4.5x

Solving
-3 + 3x2 = 4.5x

Solving for variable 'x'.

Reorder the terms:
-3 + -4.5x + 3x2 = 4.5x + -4.5x

Combine like terms: 4.5x + -4.5x = 0.0
-3 + -4.5x + 3x2 = 0.0

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

Divide each side by '3'.
-1 + -1.5x + x2 = 0.0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -1.5x + 1 + x2 = 0.0 + 1

Reorder the terms:
-1 + 1 + -1.5x + x2 = 0.0 + 1

Combine like terms: -1 + 1 = 0
0 + -1.5x + x2 = 0.0 + 1
-1.5x + x2 = 0.0 + 1

Combine like terms: 0.0 + 1 = 1
-1.5x + x2 = 1

The x term is -1.5x.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5x + 0.5625 + x2 = 1 + 0.5625

Reorder the terms:
0.5625 + -1.5x + x2 = 1 + 0.5625

Combine like terms: 1 + 0.5625 = 1.5625
0.5625 + -1.5x + x2 = 1.5625

Factor a perfect square on the left side:
(x + -0.75)(x + -0.75) = 1.5625

Calculate the square root of the right side: 1.25

Break this problem into two subproblems by setting 
(x + -0.75) equal to 1.25 and -1.25.

Subproblem 1

x + -0.75 = 1.25 Simplifying x + -0.75 = 1.25 Reorder the terms: -0.75 + x = 1.25 Solving -0.75 + x = 1.25 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = 1.25 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = 1.25 + 0.75 x = 1.25 + 0.75 Combine like terms: 1.25 + 0.75 = 2 x = 2 Simplifying x = 2

Subproblem 2

x + -0.75 = -1.25 Simplifying x + -0.75 = -1.25 Reorder the terms: -0.75 + x = -1.25 Solving -0.75 + x = -1.25 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + x = -1.25 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = -1.25 + 0.75 x = -1.25 + 0.75 Combine like terms: -1.25 + 0.75 = -0.5 x = -0.5 Simplifying x = -0.5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2, -0.5}

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