d^2+56=-19d

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Solution for d^2+56=-19d equation:


Simplifying
d2 + 56 = -19d

Reorder the terms:
56 + d2 = -19d

Solving
56 + d2 = -19d

Solving for variable 'd'.

Reorder the terms:
56 + 19d + d2 = -19d + 19d

Combine like terms: -19d + 19d = 0
56 + 19d + d2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-56' to each side of the equation.
56 + 19d + -56 + d2 = 0 + -56

Reorder the terms:
56 + -56 + 19d + d2 = 0 + -56

Combine like terms: 56 + -56 = 0
0 + 19d + d2 = 0 + -56
19d + d2 = 0 + -56

Combine like terms: 0 + -56 = -56
19d + d2 = -56

The d term is 19d.  Take half its coefficient (9.5).
Square it (90.25) and add it to both sides.

Add '90.25' to each side of the equation.
19d + 90.25 + d2 = -56 + 90.25

Reorder the terms:
90.25 + 19d + d2 = -56 + 90.25

Combine like terms: -56 + 90.25 = 34.25
90.25 + 19d + d2 = 34.25

Factor a perfect square on the left side:
(d + 9.5)(d + 9.5) = 34.25

Calculate the square root of the right side: 5.852349955

Break this problem into two subproblems by setting 
(d + 9.5) equal to 5.852349955 and -5.852349955.

Subproblem 1

d + 9.5 = 5.852349955 Simplifying d + 9.5 = 5.852349955 Reorder the terms: 9.5 + d = 5.852349955 Solving 9.5 + d = 5.852349955 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-9.5' to each side of the equation. 9.5 + -9.5 + d = 5.852349955 + -9.5 Combine like terms: 9.5 + -9.5 = 0.0 0.0 + d = 5.852349955 + -9.5 d = 5.852349955 + -9.5 Combine like terms: 5.852349955 + -9.5 = -3.647650045 d = -3.647650045 Simplifying d = -3.647650045

Subproblem 2

d + 9.5 = -5.852349955 Simplifying d + 9.5 = -5.852349955 Reorder the terms: 9.5 + d = -5.852349955 Solving 9.5 + d = -5.852349955 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-9.5' to each side of the equation. 9.5 + -9.5 + d = -5.852349955 + -9.5 Combine like terms: 9.5 + -9.5 = 0.0 0.0 + d = -5.852349955 + -9.5 d = -5.852349955 + -9.5 Combine like terms: -5.852349955 + -9.5 = -15.352349955 d = -15.352349955 Simplifying d = -15.352349955

Solution

The solution to the problem is based on the solutions from the subproblems. d = {-3.647650045, -15.352349955}

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