(x+7)(x-3)=5

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Solution for (x+7)(x-3)=5 equation:


Simplifying
(x + 7)(x + -3) = 5

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

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

Multiply (7 + x) * (-3 + x)
(7(-3 + x) + x(-3 + x)) = 5
((-3 * 7 + x * 7) + x(-3 + x)) = 5
((-21 + 7x) + x(-3 + x)) = 5
(-21 + 7x + (-3 * x + x * x)) = 5
(-21 + 7x + (-3x + x2)) = 5

Combine like terms: 7x + -3x = 4x
(-21 + 4x + x2) = 5

Solving
-21 + 4x + x2 = 5

Solving for variable 'x'.

Reorder the terms:
-21 + -5 + 4x + x2 = 5 + -5

Combine like terms: -21 + -5 = -26
-26 + 4x + x2 = 5 + -5

Combine like terms: 5 + -5 = 0
-26 + 4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '26' to each side of the equation.
-26 + 4x + 26 + x2 = 0 + 26

Reorder the terms:
-26 + 26 + 4x + x2 = 0 + 26

Combine like terms: -26 + 26 = 0
0 + 4x + x2 = 0 + 26
4x + x2 = 0 + 26

Combine like terms: 0 + 26 = 26
4x + x2 = 26

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 26 + 4

Reorder the terms:
4 + 4x + x2 = 26 + 4

Combine like terms: 26 + 4 = 30
4 + 4x + x2 = 30

Factor a perfect square on the left side:
(x + 2)(x + 2) = 30

Calculate the square root of the right side: 5.477225575

Break this problem into two subproblems by setting 
(x + 2) equal to 5.477225575 and -5.477225575.

Subproblem 1

x + 2 = 5.477225575 Simplifying x + 2 = 5.477225575 Reorder the terms: 2 + x = 5.477225575 Solving 2 + x = 5.477225575 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 5.477225575 + -2 Combine like terms: 2 + -2 = 0 0 + x = 5.477225575 + -2 x = 5.477225575 + -2 Combine like terms: 5.477225575 + -2 = 3.477225575 x = 3.477225575 Simplifying x = 3.477225575

Subproblem 2

x + 2 = -5.477225575 Simplifying x + 2 = -5.477225575 Reorder the terms: 2 + x = -5.477225575 Solving 2 + x = -5.477225575 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -5.477225575 + -2 Combine like terms: 2 + -2 = 0 0 + x = -5.477225575 + -2 x = -5.477225575 + -2 Combine like terms: -5.477225575 + -2 = -7.477225575 x = -7.477225575 Simplifying x = -7.477225575

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.477225575, -7.477225575}

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