(x+4)(x-9)=4

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Solution for (x+4)(x-9)=4 equation:


Simplifying
(x + 4)(x + -9) = 4

Reorder the terms:
(4 + x)(x + -9) = 4

Reorder the terms:
(4 + x)(-9 + x) = 4

Multiply (4 + x) * (-9 + x)
(4(-9 + x) + x(-9 + x)) = 4
((-9 * 4 + x * 4) + x(-9 + x)) = 4
((-36 + 4x) + x(-9 + x)) = 4
(-36 + 4x + (-9 * x + x * x)) = 4
(-36 + 4x + (-9x + x2)) = 4

Combine like terms: 4x + -9x = -5x
(-36 + -5x + x2) = 4

Solving
-36 + -5x + x2 = 4

Solving for variable 'x'.

Reorder the terms:
-36 + -4 + -5x + x2 = 4 + -4

Combine like terms: -36 + -4 = -40
-40 + -5x + x2 = 4 + -4

Combine like terms: 4 + -4 = 0
-40 + -5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + -5x + 40 + x2 = 0 + 40

Reorder the terms:
-40 + 40 + -5x + x2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + -5x + x2 = 0 + 40
-5x + x2 = 0 + 40

Combine like terms: 0 + 40 = 40
-5x + x2 = 40

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = 40 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 40 + 6.25

Combine like terms: 40 + 6.25 = 46.25
6.25 + -5x + x2 = 46.25

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 46.25

Calculate the square root of the right side: 6.800735254

Break this problem into two subproblems by setting 
(x + -2.5) equal to 6.800735254 and -6.800735254.

Subproblem 1

x + -2.5 = 6.800735254 Simplifying x + -2.5 = 6.800735254 Reorder the terms: -2.5 + x = 6.800735254 Solving -2.5 + x = 6.800735254 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 6.800735254 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 6.800735254 + 2.5 x = 6.800735254 + 2.5 Combine like terms: 6.800735254 + 2.5 = 9.300735254 x = 9.300735254 Simplifying x = 9.300735254

Subproblem 2

x + -2.5 = -6.800735254 Simplifying x + -2.5 = -6.800735254 Reorder the terms: -2.5 + x = -6.800735254 Solving -2.5 + x = -6.800735254 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -6.800735254 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -6.800735254 + 2.5 x = -6.800735254 + 2.5 Combine like terms: -6.800735254 + 2.5 = -4.300735254 x = -4.300735254 Simplifying x = -4.300735254

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.300735254, -4.300735254}

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