(x+8)(x-2)=121

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Solution for (x+8)(x-2)=121 equation:


Simplifying
(x + 8)(x + -2) = 121

Reorder the terms:
(8 + x)(x + -2) = 121

Reorder the terms:
(8 + x)(-2 + x) = 121

Multiply (8 + x) * (-2 + x)
(8(-2 + x) + x(-2 + x)) = 121
((-2 * 8 + x * 8) + x(-2 + x)) = 121
((-16 + 8x) + x(-2 + x)) = 121
(-16 + 8x + (-2 * x + x * x)) = 121
(-16 + 8x + (-2x + x2)) = 121

Combine like terms: 8x + -2x = 6x
(-16 + 6x + x2) = 121

Solving
-16 + 6x + x2 = 121

Solving for variable 'x'.

Reorder the terms:
-16 + -121 + 6x + x2 = 121 + -121

Combine like terms: -16 + -121 = -137
-137 + 6x + x2 = 121 + -121

Combine like terms: 121 + -121 = 0
-137 + 6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '137' to each side of the equation.
-137 + 6x + 137 + x2 = 0 + 137

Reorder the terms:
-137 + 137 + 6x + x2 = 0 + 137

Combine like terms: -137 + 137 = 0
0 + 6x + x2 = 0 + 137
6x + x2 = 0 + 137

Combine like terms: 0 + 137 = 137
6x + x2 = 137

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 = 137 + 9

Reorder the terms:
9 + 6x + x2 = 137 + 9

Combine like terms: 137 + 9 = 146
9 + 6x + x2 = 146

Factor a perfect square on the left side:
(x + 3)(x + 3) = 146

Calculate the square root of the right side: 12.083045974

Break this problem into two subproblems by setting 
(x + 3) equal to 12.083045974 and -12.083045974.

Subproblem 1

x + 3 = 12.083045974 Simplifying x + 3 = 12.083045974 Reorder the terms: 3 + x = 12.083045974 Solving 3 + x = 12.083045974 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 = 12.083045974 + -3 Combine like terms: 3 + -3 = 0 0 + x = 12.083045974 + -3 x = 12.083045974 + -3 Combine like terms: 12.083045974 + -3 = 9.083045974 x = 9.083045974 Simplifying x = 9.083045974

Subproblem 2

x + 3 = -12.083045974 Simplifying x + 3 = -12.083045974 Reorder the terms: 3 + x = -12.083045974 Solving 3 + x = -12.083045974 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 = -12.083045974 + -3 Combine like terms: 3 + -3 = 0 0 + x = -12.083045974 + -3 x = -12.083045974 + -3 Combine like terms: -12.083045974 + -3 = -15.083045974 x = -15.083045974 Simplifying x = -15.083045974

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.083045974, -15.083045974}

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