d^2+30d=11

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Solution for d^2+30d=11 equation:


Simplifying
d2 + 30d = 11

Reorder the terms:
30d + d2 = 11

Solving
30d + d2 = 11

Solving for variable 'd'.

Reorder the terms:
-11 + 30d + d2 = 11 + -11

Combine like terms: 11 + -11 = 0
-11 + 30d + d2 = 0

Begin completing the square.

Move the constant term to the right:

Add '11' to each side of the equation.
-11 + 30d + 11 + d2 = 0 + 11

Reorder the terms:
-11 + 11 + 30d + d2 = 0 + 11

Combine like terms: -11 + 11 = 0
0 + 30d + d2 = 0 + 11
30d + d2 = 0 + 11

Combine like terms: 0 + 11 = 11
30d + d2 = 11

The d term is 30d.  Take half its coefficient (15).
Square it (225) and add it to both sides.

Add '225' to each side of the equation.
30d + 225 + d2 = 11 + 225

Reorder the terms:
225 + 30d + d2 = 11 + 225

Combine like terms: 11 + 225 = 236
225 + 30d + d2 = 236

Factor a perfect square on the left side:
(d + 15)(d + 15) = 236

Calculate the square root of the right side: 15.362291496

Break this problem into two subproblems by setting 
(d + 15) equal to 15.362291496 and -15.362291496.

Subproblem 1

d + 15 = 15.362291496 Simplifying d + 15 = 15.362291496 Reorder the terms: 15 + d = 15.362291496 Solving 15 + d = 15.362291496 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + d = 15.362291496 + -15 Combine like terms: 15 + -15 = 0 0 + d = 15.362291496 + -15 d = 15.362291496 + -15 Combine like terms: 15.362291496 + -15 = 0.362291496 d = 0.362291496 Simplifying d = 0.362291496

Subproblem 2

d + 15 = -15.362291496 Simplifying d + 15 = -15.362291496 Reorder the terms: 15 + d = -15.362291496 Solving 15 + d = -15.362291496 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + d = -15.362291496 + -15 Combine like terms: 15 + -15 = 0 0 + d = -15.362291496 + -15 d = -15.362291496 + -15 Combine like terms: -15.362291496 + -15 = -30.362291496 d = -30.362291496 Simplifying d = -30.362291496

Solution

The solution to the problem is based on the solutions from the subproblems. d = {0.362291496, -30.362291496}

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