2d^2+31d+15=0

Solution for 2d^2+31d+15=0 equation:

Simplifying
2d2 + 31d + 15 = 0

Reorder the terms:
15 + 31d + 2d2 = 0

Solving
15 + 31d + 2d2 = 0

Solving for variable 'd'.

Factor a trinomial.
(15 + d)(1 + 2d) = 0

Subproblem 1
Set the factor '(15 + d)' equal to zero and attempt to solve:

Simplifying
15 + d = 0

Solving
15 + d = 0

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 = 0 + -15

Combine like terms: 15 + -15 = 0
0 + d = 0 + -15
d = 0 + -15

Combine like terms: 0 + -15 = -15
d = -15

Simplifying
d = -15
Subproblem 2
Set the factor '(1 + 2d)' equal to zero and attempt to solve:

Simplifying
1 + 2d = 0

Solving
1 + 2d = 0

Move all terms containing d to the left, all other terms to the right.

Add '-1' to each side of the equation.
1 + -1 + 2d = 0 + -1

Combine like terms: 1 + -1 = 0
0 + 2d = 0 + -1
2d = 0 + -1

Combine like terms: 0 + -1 = -1
2d = -1

Divide each side by '2'.
d = -0.5

Simplifying
d = -0.5
Solution
d = {-15, -0.5}