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

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Solution for 5=(x-4)(x+3) equation:


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

Reorder the terms:
5 = (-4 + x)(x + 3)

Reorder the terms:
5 = (-4 + x)(3 + x)

Multiply (-4 + x) * (3 + x)
5 = (-4(3 + x) + x(3 + x))
5 = ((3 * -4 + x * -4) + x(3 + x))
5 = ((-12 + -4x) + x(3 + x))
5 = (-12 + -4x + (3 * x + x * x))
5 = (-12 + -4x + (3x + x2))

Combine like terms: -4x + 3x = -1x
5 = (-12 + -1x + x2)

Solving
5 = -12 + -1x + x2

Solving for variable 'x'.

Combine like terms: 5 + 12 = 17
17 + x + -1x2 = -12 + -1x + x2 + 12 + x + -1x2

Reorder the terms:
17 + x + -1x2 = -12 + 12 + -1x + x + x2 + -1x2

Combine like terms: -12 + 12 = 0
17 + x + -1x2 = 0 + -1x + x + x2 + -1x2
17 + x + -1x2 = -1x + x + x2 + -1x2

Combine like terms: -1x + x = 0
17 + x + -1x2 = 0 + x2 + -1x2
17 + x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
17 + x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-17 + -1x + x2 = 0

Move the constant term to the right:

Add '17' to each side of the equation.
-17 + -1x + 17 + x2 = 0 + 17

Reorder the terms:
-17 + 17 + -1x + x2 = 0 + 17

Combine like terms: -17 + 17 = 0
0 + -1x + x2 = 0 + 17
-1x + x2 = 0 + 17

Combine like terms: 0 + 17 = 17
-1x + x2 = 17

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = 17 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 17 + 0.25

Combine like terms: 17 + 0.25 = 17.25
0.25 + -1x + x2 = 17.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 17.25

Calculate the square root of the right side: 4.153311931

Break this problem into two subproblems by setting 
(x + 0.5) equal to 4.153311931 and -4.153311931.

Subproblem 1

x + 0.5 = 4.153311931 Simplifying x + 0.5 = 4.153311931 Reorder the terms: 0.5 + x = 4.153311931 Solving 0.5 + x = 4.153311931 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 4.153311931 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 4.153311931 + -0.5 x = 4.153311931 + -0.5 Combine like terms: 4.153311931 + -0.5 = 3.653311931 x = 3.653311931 Simplifying x = 3.653311931

Subproblem 2

x + 0.5 = -4.153311931 Simplifying x + 0.5 = -4.153311931 Reorder the terms: 0.5 + x = -4.153311931 Solving 0.5 + x = -4.153311931 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -4.153311931 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -4.153311931 + -0.5 x = -4.153311931 + -0.5 Combine like terms: -4.153311931 + -0.5 = -4.653311931 x = -4.653311931 Simplifying x = -4.653311931

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.653311931, -4.653311931}

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