(x-4)*(x+3)=20

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Solution for (x-4)*(x+3)=20 equation:


Simplifying
(x + -4)(x + 3) = 20

Reorder the terms:
(-4 + x)(x + 3) = 20

Reorder the terms:
(-4 + x)(3 + x) = 20

Multiply (-4 + x) * (3 + x)
(-4(3 + x) + x(3 + x)) = 20
((3 * -4 + x * -4) + x(3 + x)) = 20
((-12 + -4x) + x(3 + x)) = 20
(-12 + -4x + (3 * x + x * x)) = 20
(-12 + -4x + (3x + x2)) = 20

Combine like terms: -4x + 3x = -1x
(-12 + -1x + x2) = 20

Solving
-12 + -1x + x2 = 20

Solving for variable 'x'.

Reorder the terms:
-12 + -20 + -1x + x2 = 20 + -20

Combine like terms: -12 + -20 = -32
-32 + -1x + x2 = 20 + -20

Combine like terms: 20 + -20 = 0
-32 + -1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '32' to each side of the equation.
-32 + -1x + 32 + x2 = 0 + 32

Reorder the terms:
-32 + 32 + -1x + x2 = 0 + 32

Combine like terms: -32 + 32 = 0
0 + -1x + x2 = 0 + 32
-1x + x2 = 0 + 32

Combine like terms: 0 + 32 = 32
-1x + x2 = 32

The x term is -1x.  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 = 32 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 32 + 0.25

Combine like terms: 32 + 0.25 = 32.25
0.25 + -1x + x2 = 32.25

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 32.25

Calculate the square root of the right side: 5.678908346

Break this problem into two subproblems by setting 
(x + -0.5) equal to 5.678908346 and -5.678908346.

Subproblem 1

x + -0.5 = 5.678908346 Simplifying x + -0.5 = 5.678908346 Reorder the terms: -0.5 + x = 5.678908346 Solving -0.5 + x = 5.678908346 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 = 5.678908346 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 5.678908346 + 0.5 x = 5.678908346 + 0.5 Combine like terms: 5.678908346 + 0.5 = 6.178908346 x = 6.178908346 Simplifying x = 6.178908346

Subproblem 2

x + -0.5 = -5.678908346 Simplifying x + -0.5 = -5.678908346 Reorder the terms: -0.5 + x = -5.678908346 Solving -0.5 + x = -5.678908346 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 = -5.678908346 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -5.678908346 + 0.5 x = -5.678908346 + 0.5 Combine like terms: -5.678908346 + 0.5 = -5.178908346 x = -5.178908346 Simplifying x = -5.178908346

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.178908346, -5.178908346}

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