9x+4=5.5x+.5x^2

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Solution for 9x+4=5.5x+.5x^2 equation:


Simplifying
9x + 4 = 5.5x + 0.5x2

Reorder the terms:
4 + 9x = 5.5x + 0.5x2

Solving
4 + 9x = 5.5x + 0.5x2

Solving for variable 'x'.

Combine like terms: 9x + -5.5x = 3.5x
4 + 3.5x + -0.5x2 = 5.5x + 0.5x2 + -5.5x + -0.5x2

Reorder the terms:
4 + 3.5x + -0.5x2 = 5.5x + -5.5x + 0.5x2 + -0.5x2

Combine like terms: 5.5x + -5.5x = 0.0
4 + 3.5x + -0.5x2 = 0.0 + 0.5x2 + -0.5x2
4 + 3.5x + -0.5x2 = 0.5x2 + -0.5x2

Combine like terms: 0.5x2 + -0.5x2 = 0.0
4 + 3.5x + -0.5x2 = 0.0

Begin completing the square.  Divide all terms by
-0.5 the coefficient of the squared term: 

Divide each side by '-0.5'.
-8 + -7x + x2 = 0

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -7x + 8 + x2 = 0 + 8

Reorder the terms:
-8 + 8 + -7x + x2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -7x + x2 = 0 + 8
-7x + x2 = 0 + 8

Combine like terms: 0 + 8 = 8
-7x + x2 = 8

The x term is -7x.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7x + 12.25 + x2 = 8 + 12.25

Reorder the terms:
12.25 + -7x + x2 = 8 + 12.25

Combine like terms: 8 + 12.25 = 20.25
12.25 + -7x + x2 = 20.25

Factor a perfect square on the left side:
(x + -3.5)(x + -3.5) = 20.25

Calculate the square root of the right side: 4.5

Break this problem into two subproblems by setting 
(x + -3.5) equal to 4.5 and -4.5.

Subproblem 1

x + -3.5 = 4.5 Simplifying x + -3.5 = 4.5 Reorder the terms: -3.5 + x = 4.5 Solving -3.5 + x = 4.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = 4.5 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = 4.5 + 3.5 x = 4.5 + 3.5 Combine like terms: 4.5 + 3.5 = 8 x = 8 Simplifying x = 8

Subproblem 2

x + -3.5 = -4.5 Simplifying x + -3.5 = -4.5 Reorder the terms: -3.5 + x = -4.5 Solving -3.5 + x = -4.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = -4.5 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = -4.5 + 3.5 x = -4.5 + 3.5 Combine like terms: -4.5 + 3.5 = -1 x = -1 Simplifying x = -1

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8, -1}

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