2x^2+5x=-6

Solution for 2x^2+5x=-6 equation:

Simplifying
2x2 + 5x = -6

Reorder the terms:
5x + 2x2 = -6

Solving
5x + 2x2 = -6

Solving for variable 'x'.

Reorder the terms:
6 + 5x + 2x2 = -6 + 6

Combine like terms: -6 + 6 = 0
6 + 5x + 2x2 = 0

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

Divide each side by '2'.
3 + 2.5x + x2 = 0

Move the constant term to the right:

Add '-3' to each side of the equation.
3 + 2.5x + -3 + x2 = 0 + -3

Reorder the terms:
3 + -3 + 2.5x + x2 = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 2.5x + x2 = 0 + -3
2.5x + x2 = 0 + -3

Combine like terms: 0 + -3 = -3
2.5x + x2 = -3

The x term is 2.5x.  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.
2.5x + 1.5625 + x2 = -3 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = -3 + 1.5625

Combine like terms: -3 + 1.5625 = -1.4375
1.5625 + 2.5x + x2 = -1.4375

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = -1.4375

Can't calculate square root of the right side.

The solution to this equation could not be determined.