(x-3)(x+9)=4

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Solution for (x-3)(x+9)=4 equation:


Simplifying
(x + -3)(x + 9) = 4

Reorder the terms:
(-3 + x)(x + 9) = 4

Reorder the terms:
(-3 + x)(9 + x) = 4

Multiply (-3 + x) * (9 + x)
(-3(9 + x) + x(9 + x)) = 4
((9 * -3 + x * -3) + x(9 + x)) = 4
((-27 + -3x) + x(9 + x)) = 4
(-27 + -3x + (9 * x + x * x)) = 4
(-27 + -3x + (9x + x2)) = 4

Combine like terms: -3x + 9x = 6x
(-27 + 6x + x2) = 4

Solving
-27 + 6x + x2 = 4

Solving for variable 'x'.

Reorder the terms:
-27 + -4 + 6x + x2 = 4 + -4

Combine like terms: -27 + -4 = -31
-31 + 6x + x2 = 4 + -4

Combine like terms: 4 + -4 = 0
-31 + 6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '31' to each side of the equation.
-31 + 6x + 31 + x2 = 0 + 31

Reorder the terms:
-31 + 31 + 6x + x2 = 0 + 31

Combine like terms: -31 + 31 = 0
0 + 6x + x2 = 0 + 31
6x + x2 = 0 + 31

Combine like terms: 0 + 31 = 31
6x + x2 = 31

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 31 + 9

Reorder the terms:
9 + 6x + x2 = 31 + 9

Combine like terms: 31 + 9 = 40
9 + 6x + x2 = 40

Factor a perfect square on the left side:
(x + 3)(x + 3) = 40

Calculate the square root of the right side: 6.32455532

Break this problem into two subproblems by setting 
(x + 3) equal to 6.32455532 and -6.32455532.

Subproblem 1

x + 3 = 6.32455532 Simplifying x + 3 = 6.32455532 Reorder the terms: 3 + x = 6.32455532 Solving 3 + x = 6.32455532 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 6.32455532 + -3 Combine like terms: 3 + -3 = 0 0 + x = 6.32455532 + -3 x = 6.32455532 + -3 Combine like terms: 6.32455532 + -3 = 3.32455532 x = 3.32455532 Simplifying x = 3.32455532

Subproblem 2

x + 3 = -6.32455532 Simplifying x + 3 = -6.32455532 Reorder the terms: 3 + x = -6.32455532 Solving 3 + x = -6.32455532 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -6.32455532 + -3 Combine like terms: 3 + -3 = 0 0 + x = -6.32455532 + -3 x = -6.32455532 + -3 Combine like terms: -6.32455532 + -3 = -9.32455532 x = -9.32455532 Simplifying x = -9.32455532

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.32455532, -9.32455532}

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