0=-4x^2+6x+9

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Solution for 0=-4x^2+6x+9 equation:


Simplifying
0 = -4x2 + 6x + 9

Reorder the terms:
0 = 9 + 6x + -4x2

Solving
0 = 9 + 6x + -4x2

Solving for variable 'x'.

Combine like terms: 0 + -9 = -9
-9 + -6x + 4x2 = 9 + 6x + -4x2 + -9 + -6x + 4x2

Reorder the terms:
-9 + -6x + 4x2 = 9 + -9 + 6x + -6x + -4x2 + 4x2

Combine like terms: 9 + -9 = 0
-9 + -6x + 4x2 = 0 + 6x + -6x + -4x2 + 4x2
-9 + -6x + 4x2 = 6x + -6x + -4x2 + 4x2

Combine like terms: 6x + -6x = 0
-9 + -6x + 4x2 = 0 + -4x2 + 4x2
-9 + -6x + 4x2 = -4x2 + 4x2

Combine like terms: -4x2 + 4x2 = 0
-9 + -6x + 4x2 = 0

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

Divide each side by '4'.
-2.25 + -1.5x + x2 = 0

Move the constant term to the right:

Add '2.25' to each side of the equation.
-2.25 + -1.5x + 2.25 + x2 = 0 + 2.25

Reorder the terms:
-2.25 + 2.25 + -1.5x + x2 = 0 + 2.25

Combine like terms: -2.25 + 2.25 = 0.00
0.00 + -1.5x + x2 = 0 + 2.25
-1.5x + x2 = 0 + 2.25

Combine like terms: 0 + 2.25 = 2.25
-1.5x + x2 = 2.25

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 = 2.25 + 0.5625

Reorder the terms:
0.5625 + -1.5x + x2 = 2.25 + 0.5625

Combine like terms: 2.25 + 0.5625 = 2.8125
0.5625 + -1.5x + x2 = 2.8125

Factor a perfect square on the left side:
(x + -0.75)(x + -0.75) = 2.8125

Calculate the square root of the right side: 1.677050983

Break this problem into two subproblems by setting 
(x + -0.75) equal to 1.677050983 and -1.677050983.

Subproblem 1

x + -0.75 = 1.677050983 Simplifying x + -0.75 = 1.677050983 Reorder the terms: -0.75 + x = 1.677050983 Solving -0.75 + x = 1.677050983 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 = 1.677050983 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = 1.677050983 + 0.75 x = 1.677050983 + 0.75 Combine like terms: 1.677050983 + 0.75 = 2.427050983 x = 2.427050983 Simplifying x = 2.427050983

Subproblem 2

x + -0.75 = -1.677050983 Simplifying x + -0.75 = -1.677050983 Reorder the terms: -0.75 + x = -1.677050983 Solving -0.75 + x = -1.677050983 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 = -1.677050983 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + x = -1.677050983 + 0.75 x = -1.677050983 + 0.75 Combine like terms: -1.677050983 + 0.75 = -0.927050983 x = -0.927050983 Simplifying x = -0.927050983

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.427050983, -0.927050983}

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