2n^2+5n=-4

Solution for 2n^2+5n=-4 equation:

Simplifying
2n2 + 5n = -4

Reorder the terms:
5n + 2n2 = -4

Solving
5n + 2n2 = -4

Solving for variable 'n'.

Reorder the terms:
4 + 5n + 2n2 = -4 + 4

Combine like terms: -4 + 4 = 0
4 + 5n + 2n2 = 0

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
2 + 2.5n + n2 = 0

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + 2.5n + -2 + n2 = 0 + -2

Reorder the terms:
2 + -2 + 2.5n + n2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + 2.5n + n2 = 0 + -2
2.5n + n2 = 0 + -2

Combine like terms: 0 + -2 = -2
2.5n + n2 = -2

The n term is 2.5n.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5n + 1.5625 + n2 = -2 + 1.5625

Reorder the terms:
1.5625 + 2.5n + n2 = -2 + 1.5625

Combine like terms: -2 + 1.5625 = -0.4375
1.5625 + 2.5n + n2 = -0.4375

Factor a perfect square on the left side:
(n + 1.25)(n + 1.25) = -0.4375

Can't calculate square root of the right side.

The solution to this equation could not be determined.