d^2-8d-12=2

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Solution for d^2-8d-12=2 equation:


Simplifying
d2 + -8d + -12 = 2

Reorder the terms:
-12 + -8d + d2 = 2

Solving
-12 + -8d + d2 = 2

Solving for variable 'd'.

Reorder the terms:
-12 + -2 + -8d + d2 = 2 + -2

Combine like terms: -12 + -2 = -14
-14 + -8d + d2 = 2 + -2

Combine like terms: 2 + -2 = 0
-14 + -8d + d2 = 0

Begin completing the square.

Move the constant term to the right:

Add '14' to each side of the equation.
-14 + -8d + 14 + d2 = 0 + 14

Reorder the terms:
-14 + 14 + -8d + d2 = 0 + 14

Combine like terms: -14 + 14 = 0
0 + -8d + d2 = 0 + 14
-8d + d2 = 0 + 14

Combine like terms: 0 + 14 = 14
-8d + d2 = 14

The d term is -8d.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8d + 16 + d2 = 14 + 16

Reorder the terms:
16 + -8d + d2 = 14 + 16

Combine like terms: 14 + 16 = 30
16 + -8d + d2 = 30

Factor a perfect square on the left side:
(d + -4)(d + -4) = 30

Calculate the square root of the right side: 5.477225575

Break this problem into two subproblems by setting 
(d + -4) equal to 5.477225575 and -5.477225575.

Subproblem 1

d + -4 = 5.477225575 Simplifying d + -4 = 5.477225575 Reorder the terms: -4 + d = 5.477225575 Solving -4 + d = 5.477225575 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + d = 5.477225575 + 4 Combine like terms: -4 + 4 = 0 0 + d = 5.477225575 + 4 d = 5.477225575 + 4 Combine like terms: 5.477225575 + 4 = 9.477225575 d = 9.477225575 Simplifying d = 9.477225575

Subproblem 2

d + -4 = -5.477225575 Simplifying d + -4 = -5.477225575 Reorder the terms: -4 + d = -5.477225575 Solving -4 + d = -5.477225575 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + d = -5.477225575 + 4 Combine like terms: -4 + 4 = 0 0 + d = -5.477225575 + 4 d = -5.477225575 + 4 Combine like terms: -5.477225575 + 4 = -1.477225575 d = -1.477225575 Simplifying d = -1.477225575

Solution

The solution to the problem is based on the solutions from the subproblems. d = {9.477225575, -1.477225575}

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