d^2+10d+11=0

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Solution for d^2+10d+11=0 equation:


Simplifying
d2 + 10d + 11 = 0

Reorder the terms:
11 + 10d + d2 = 0

Solving
11 + 10d + d2 = 0

Solving for variable 'd'.

Begin completing the square.

Move the constant term to the right:

Add '-11' to each side of the equation.
11 + 10d + -11 + d2 = 0 + -11

Reorder the terms:
11 + -11 + 10d + d2 = 0 + -11

Combine like terms: 11 + -11 = 0
0 + 10d + d2 = 0 + -11
10d + d2 = 0 + -11

Combine like terms: 0 + -11 = -11
10d + d2 = -11

The d term is 10d.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10d + 25 + d2 = -11 + 25

Reorder the terms:
25 + 10d + d2 = -11 + 25

Combine like terms: -11 + 25 = 14
25 + 10d + d2 = 14

Factor a perfect square on the left side:
(d + 5)(d + 5) = 14

Calculate the square root of the right side: 3.741657387

Break this problem into two subproblems by setting 
(d + 5) equal to 3.741657387 and -3.741657387.

Subproblem 1

d + 5 = 3.741657387 Simplifying d + 5 = 3.741657387 Reorder the terms: 5 + d = 3.741657387 Solving 5 + d = 3.741657387 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + d = 3.741657387 + -5 Combine like terms: 5 + -5 = 0 0 + d = 3.741657387 + -5 d = 3.741657387 + -5 Combine like terms: 3.741657387 + -5 = -1.258342613 d = -1.258342613 Simplifying d = -1.258342613

Subproblem 2

d + 5 = -3.741657387 Simplifying d + 5 = -3.741657387 Reorder the terms: 5 + d = -3.741657387 Solving 5 + d = -3.741657387 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + d = -3.741657387 + -5 Combine like terms: 5 + -5 = 0 0 + d = -3.741657387 + -5 d = -3.741657387 + -5 Combine like terms: -3.741657387 + -5 = -8.741657387 d = -8.741657387 Simplifying d = -8.741657387

Solution

The solution to the problem is based on the solutions from the subproblems. d = {-1.258342613, -8.741657387}

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