2n^2+4=-9n

Solution for 2n^2+4=-9n equation:

Simplifying
2n2 + 4 = -9n

Reorder the terms:
4 + 2n2 = -9n

Solving
4 + 2n2 = -9n

Solving for variable 'n'.

Reorder the terms:
4 + 9n + 2n2 = -9n + 9n

Combine like terms: -9n + 9n = 0
4 + 9n + 2n2 = 0

Factor a trinomial.
(4 + n)(1 + 2n) = 0

Subproblem 1
Set the factor '(4 + n)' equal to zero and attempt to solve:

Simplifying
4 + n = 0

Solving
4 + n = 0

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

Add '-4' to each side of the equation.
4 + -4 + n = 0 + -4

Combine like terms: 4 + -4 = 0
0 + n = 0 + -4
n = 0 + -4

Combine like terms: 0 + -4 = -4
n = -4

Simplifying
n = -4
Subproblem 2
Set the factor '(1 + 2n)' equal to zero and attempt to solve:

Simplifying
1 + 2n = 0

Solving
1 + 2n = 0

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

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

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

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

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

Simplifying
n = -0.5
Solution
n = {-4, -0.5}