(x+3)(x-5)=5x-9

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Solution for (x+3)(x-5)=5x-9 equation:


Simplifying
(x + 3)(x + -5) = 5x + -9

Reorder the terms:
(3 + x)(x + -5) = 5x + -9

Reorder the terms:
(3 + x)(-5 + x) = 5x + -9

Multiply (3 + x) * (-5 + x)
(3(-5 + x) + x(-5 + x)) = 5x + -9
((-5 * 3 + x * 3) + x(-5 + x)) = 5x + -9
((-15 + 3x) + x(-5 + x)) = 5x + -9
(-15 + 3x + (-5 * x + x * x)) = 5x + -9
(-15 + 3x + (-5x + x2)) = 5x + -9

Combine like terms: 3x + -5x = -2x
(-15 + -2x + x2) = 5x + -9

Reorder the terms:
-15 + -2x + x2 = -9 + 5x

Solving
-15 + -2x + x2 = -9 + 5x

Solving for variable 'x'.

Reorder the terms:
-15 + 9 + -2x + -5x + x2 = -9 + 5x + 9 + -5x

Combine like terms: -15 + 9 = -6
-6 + -2x + -5x + x2 = -9 + 5x + 9 + -5x

Combine like terms: -2x + -5x = -7x
-6 + -7x + x2 = -9 + 5x + 9 + -5x

Reorder the terms:
-6 + -7x + x2 = -9 + 9 + 5x + -5x

Combine like terms: -9 + 9 = 0
-6 + -7x + x2 = 0 + 5x + -5x
-6 + -7x + x2 = 5x + -5x

Combine like terms: 5x + -5x = 0
-6 + -7x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + -7x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + -7x + x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -7x + x2 = 0 + 6
-7x + x2 = 0 + 6

Combine like terms: 0 + 6 = 6
-7x + x2 = 6

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 = 6 + 12.25

Reorder the terms:
12.25 + -7x + x2 = 6 + 12.25

Combine like terms: 6 + 12.25 = 18.25
12.25 + -7x + x2 = 18.25

Factor a perfect square on the left side:
(x + -3.5)(x + -3.5) = 18.25

Calculate the square root of the right side: 4.272001873

Break this problem into two subproblems by setting 
(x + -3.5) equal to 4.272001873 and -4.272001873.

Subproblem 1

x + -3.5 = 4.272001873 Simplifying x + -3.5 = 4.272001873 Reorder the terms: -3.5 + x = 4.272001873 Solving -3.5 + x = 4.272001873 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 = 4.272001873 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = 4.272001873 + 3.5 x = 4.272001873 + 3.5 Combine like terms: 4.272001873 + 3.5 = 7.772001873 x = 7.772001873 Simplifying x = 7.772001873

Subproblem 2

x + -3.5 = -4.272001873 Simplifying x + -3.5 = -4.272001873 Reorder the terms: -3.5 + x = -4.272001873 Solving -3.5 + x = -4.272001873 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 = -4.272001873 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = -4.272001873 + 3.5 x = -4.272001873 + 3.5 Combine like terms: -4.272001873 + 3.5 = -0.772001873 x = -0.772001873 Simplifying x = -0.772001873

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.772001873, -0.772001873}

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