(x-3)(x+4)=x*2+4

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Solution for (x-3)(x+4)=x*2+4 equation:


Simplifying
(x + -3)(x + 4) = x * 2 + 4

Reorder the terms:
(-3 + x)(x + 4) = x * 2 + 4

Reorder the terms:
(-3 + x)(4 + x) = x * 2 + 4

Multiply (-3 + x) * (4 + x)
(-3(4 + x) + x(4 + x)) = x * 2 + 4
((4 * -3 + x * -3) + x(4 + x)) = x * 2 + 4
((-12 + -3x) + x(4 + x)) = x * 2 + 4
(-12 + -3x + (4 * x + x * x)) = x * 2 + 4
(-12 + -3x + (4x + x2)) = x * 2 + 4

Combine like terms: -3x + 4x = 1x
(-12 + 1x + x2) = x * 2 + 4

Reorder the terms for easier multiplication:
-12 + 1x + x2 = 2x + 4

Reorder the terms:
-12 + 1x + x2 = 4 + 2x

Solving
-12 + 1x + x2 = 4 + 2x

Solving for variable 'x'.

Reorder the terms:
-12 + -4 + 1x + -2x + x2 = 4 + 2x + -4 + -2x

Combine like terms: -12 + -4 = -16
-16 + 1x + -2x + x2 = 4 + 2x + -4 + -2x

Combine like terms: 1x + -2x = -1x
-16 + -1x + x2 = 4 + 2x + -4 + -2x

Reorder the terms:
-16 + -1x + x2 = 4 + -4 + 2x + -2x

Combine like terms: 4 + -4 = 0
-16 + -1x + x2 = 0 + 2x + -2x
-16 + -1x + x2 = 2x + -2x

Combine like terms: 2x + -2x = 0
-16 + -1x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + -1x + 16 + x2 = 0 + 16

Reorder the terms:
-16 + 16 + -1x + x2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + -1x + x2 = 0 + 16
-1x + x2 = 0 + 16

Combine like terms: 0 + 16 = 16
-1x + x2 = 16

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 = 16 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 16 + 0.25

Combine like terms: 16 + 0.25 = 16.25
0.25 + -1x + x2 = 16.25

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 16.25

Calculate the square root of the right side: 4.031128874

Break this problem into two subproblems by setting 
(x + -0.5) equal to 4.031128874 and -4.031128874.

Subproblem 1

x + -0.5 = 4.031128874 Simplifying x + -0.5 = 4.031128874 Reorder the terms: -0.5 + x = 4.031128874 Solving -0.5 + x = 4.031128874 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 = 4.031128874 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 4.031128874 + 0.5 x = 4.031128874 + 0.5 Combine like terms: 4.031128874 + 0.5 = 4.531128874 x = 4.531128874 Simplifying x = 4.531128874

Subproblem 2

x + -0.5 = -4.031128874 Simplifying x + -0.5 = -4.031128874 Reorder the terms: -0.5 + x = -4.031128874 Solving -0.5 + x = -4.031128874 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 = -4.031128874 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -4.031128874 + 0.5 x = -4.031128874 + 0.5 Combine like terms: -4.031128874 + 0.5 = -3.531128874 x = -3.531128874 Simplifying x = -3.531128874

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.531128874, -3.531128874}

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