(x+7)(x-3)=(x+1)

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Solution for (x+7)(x-3)=(x+1) equation:


Simplifying
(x + 7)(x + -3) = (x + 1)

Reorder the terms:
(7 + x)(x + -3) = (x + 1)

Reorder the terms:
(7 + x)(-3 + x) = (x + 1)

Multiply (7 + x) * (-3 + x)
(7(-3 + x) + x(-3 + x)) = (x + 1)
((-3 * 7 + x * 7) + x(-3 + x)) = (x + 1)
((-21 + 7x) + x(-3 + x)) = (x + 1)
(-21 + 7x + (-3 * x + x * x)) = (x + 1)
(-21 + 7x + (-3x + x2)) = (x + 1)

Combine like terms: 7x + -3x = 4x
(-21 + 4x + x2) = (x + 1)

Reorder the terms:
-21 + 4x + x2 = (1 + x)

Remove parenthesis around (1 + x)
-21 + 4x + x2 = 1 + x

Solving
-21 + 4x + x2 = 1 + x

Solving for variable 'x'.

Reorder the terms:
-21 + -1 + 4x + -1x + x2 = 1 + x + -1 + -1x

Combine like terms: -21 + -1 = -22
-22 + 4x + -1x + x2 = 1 + x + -1 + -1x

Combine like terms: 4x + -1x = 3x
-22 + 3x + x2 = 1 + x + -1 + -1x

Reorder the terms:
-22 + 3x + x2 = 1 + -1 + x + -1x

Combine like terms: 1 + -1 = 0
-22 + 3x + x2 = 0 + x + -1x
-22 + 3x + x2 = x + -1x

Combine like terms: x + -1x = 0
-22 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '22' to each side of the equation.
-22 + 3x + 22 + x2 = 0 + 22

Reorder the terms:
-22 + 22 + 3x + x2 = 0 + 22

Combine like terms: -22 + 22 = 0
0 + 3x + x2 = 0 + 22
3x + x2 = 0 + 22

Combine like terms: 0 + 22 = 22
3x + x2 = 22

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 22 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 22 + 2.25

Combine like terms: 22 + 2.25 = 24.25
2.25 + 3x + x2 = 24.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 24.25

Calculate the square root of the right side: 4.924428901

Break this problem into two subproblems by setting 
(x + 1.5) equal to 4.924428901 and -4.924428901.

Subproblem 1

x + 1.5 = 4.924428901 Simplifying x + 1.5 = 4.924428901 Reorder the terms: 1.5 + x = 4.924428901 Solving 1.5 + x = 4.924428901 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 4.924428901 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 4.924428901 + -1.5 x = 4.924428901 + -1.5 Combine like terms: 4.924428901 + -1.5 = 3.424428901 x = 3.424428901 Simplifying x = 3.424428901

Subproblem 2

x + 1.5 = -4.924428901 Simplifying x + 1.5 = -4.924428901 Reorder the terms: 1.5 + x = -4.924428901 Solving 1.5 + x = -4.924428901 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -4.924428901 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -4.924428901 + -1.5 x = -4.924428901 + -1.5 Combine like terms: -4.924428901 + -1.5 = -6.424428901 x = -6.424428901 Simplifying x = -6.424428901

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.424428901, -6.424428901}

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