(x-7)(x+1)=16

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Solution for (x-7)(x+1)=16 equation:


Simplifying
(x + -7)(x + 1) = 16

Reorder the terms:
(-7 + x)(x + 1) = 16

Reorder the terms:
(-7 + x)(1 + x) = 16

Multiply (-7 + x) * (1 + x)
(-7(1 + x) + x(1 + x)) = 16
((1 * -7 + x * -7) + x(1 + x)) = 16
((-7 + -7x) + x(1 + x)) = 16
(-7 + -7x + (1 * x + x * x)) = 16
(-7 + -7x + (1x + x2)) = 16

Combine like terms: -7x + 1x = -6x
(-7 + -6x + x2) = 16

Solving
-7 + -6x + x2 = 16

Solving for variable 'x'.

Reorder the terms:
-7 + -16 + -6x + x2 = 16 + -16

Combine like terms: -7 + -16 = -23
-23 + -6x + x2 = 16 + -16

Combine like terms: 16 + -16 = 0
-23 + -6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '23' to each side of the equation.
-23 + -6x + 23 + x2 = 0 + 23

Reorder the terms:
-23 + 23 + -6x + x2 = 0 + 23

Combine like terms: -23 + 23 = 0
0 + -6x + x2 = 0 + 23
-6x + x2 = 0 + 23

Combine like terms: 0 + 23 = 23
-6x + x2 = 23

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = 23 + 9

Reorder the terms:
9 + -6x + x2 = 23 + 9

Combine like terms: 23 + 9 = 32
9 + -6x + x2 = 32

Factor a perfect square on the left side:
(x + -3)(x + -3) = 32

Calculate the square root of the right side: 5.656854249

Break this problem into two subproblems by setting 
(x + -3) equal to 5.656854249 and -5.656854249.

Subproblem 1

x + -3 = 5.656854249 Simplifying x + -3 = 5.656854249 Reorder the terms: -3 + x = 5.656854249 Solving -3 + x = 5.656854249 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 5.656854249 + 3 Combine like terms: -3 + 3 = 0 0 + x = 5.656854249 + 3 x = 5.656854249 + 3 Combine like terms: 5.656854249 + 3 = 8.656854249 x = 8.656854249 Simplifying x = 8.656854249

Subproblem 2

x + -3 = -5.656854249 Simplifying x + -3 = -5.656854249 Reorder the terms: -3 + x = -5.656854249 Solving -3 + x = -5.656854249 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -5.656854249 + 3 Combine like terms: -3 + 3 = 0 0 + x = -5.656854249 + 3 x = -5.656854249 + 3 Combine like terms: -5.656854249 + 3 = -2.656854249 x = -2.656854249 Simplifying x = -2.656854249

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.656854249, -2.656854249}

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