5x^2+7x+8=

Solution for 5x^2+7x+8= equation:

Simplifying
5x2 + 7x + 8 = 0

Reorder the terms:
8 + 7x + 5x2 = 0

Solving
8 + 7x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
1.6 + 1.4x + x2 = 0

Move the constant term to the right:

Add '-1.6' to each side of the equation.
1.6 + 1.4x + -1.6 + x2 = 0 + -1.6

Reorder the terms:
1.6 + -1.6 + 1.4x + x2 = 0 + -1.6

Combine like terms: 1.6 + -1.6 = 0.0
0.0 + 1.4x + x2 = 0 + -1.6
1.4x + x2 = 0 + -1.6

Combine like terms: 0 + -1.6 = -1.6
1.4x + x2 = -1.6

The x term is 1.4x.  Take half its coefficient (0.7).
Square it (0.49) and add it to both sides.

Add '0.49' to each side of the equation.
1.4x + 0.49 + x2 = -1.6 + 0.49

Reorder the terms:
0.49 + 1.4x + x2 = -1.6 + 0.49

Combine like terms: -1.6 + 0.49 = -1.11
0.49 + 1.4x + x2 = -1.11

Factor a perfect square on the left side:
(x + 0.7)(x + 0.7) = -1.11

Can't calculate square root of the right side.

The solution to this equation could not be determined.