d^2+4d-11=0

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Solution for d^2+4d-11=0 equation:


Simplifying
d2 + 4d + -11 = 0

Reorder the terms:
-11 + 4d + d2 = 0

Solving
-11 + 4d + 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 + 4d + 11 + d2 = 0 + 11

Reorder the terms:
-11 + 11 + 4d + d2 = 0 + 11

Combine like terms: -11 + 11 = 0
0 + 4d + d2 = 0 + 11
4d + d2 = 0 + 11

Combine like terms: 0 + 11 = 11
4d + d2 = 11

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

Add '4' to each side of the equation.
4d + 4 + d2 = 11 + 4

Reorder the terms:
4 + 4d + d2 = 11 + 4

Combine like terms: 11 + 4 = 15
4 + 4d + d2 = 15

Factor a perfect square on the left side:
(d + 2)(d + 2) = 15

Calculate the square root of the right side: 3.872983346

Break this problem into two subproblems by setting 
(d + 2) equal to 3.872983346 and -3.872983346.

Subproblem 1

d + 2 = 3.872983346 Simplifying d + 2 = 3.872983346 Reorder the terms: 2 + d = 3.872983346 Solving 2 + d = 3.872983346 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + d = 3.872983346 + -2 Combine like terms: 2 + -2 = 0 0 + d = 3.872983346 + -2 d = 3.872983346 + -2 Combine like terms: 3.872983346 + -2 = 1.872983346 d = 1.872983346 Simplifying d = 1.872983346

Subproblem 2

d + 2 = -3.872983346 Simplifying d + 2 = -3.872983346 Reorder the terms: 2 + d = -3.872983346 Solving 2 + d = -3.872983346 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + d = -3.872983346 + -2 Combine like terms: 2 + -2 = 0 0 + d = -3.872983346 + -2 d = -3.872983346 + -2 Combine like terms: -3.872983346 + -2 = -5.872983346 d = -5.872983346 Simplifying d = -5.872983346

Solution

The solution to the problem is based on the solutions from the subproblems. d = {1.872983346, -5.872983346}

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