2x^2+7x=-8

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


Simplifying
2x2 + 7x = -8

Reorder the terms:
7x + 2x2 = -8

Solving
7x + 2x2 = -8

Solving for variable 'x'.

Reorder the terms:
8 + 7x + 2x2 = -8 + 8

Combine like terms: -8 + 8 = 0
8 + 7x + 2x2 = 0

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

Divide each side by '2'.
4 + 3.5x + x2 = 0

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + 3.5x + -4 + x2 = 0 + -4

Reorder the terms:
4 + -4 + 3.5x + x2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + 3.5x + x2 = 0 + -4
3.5x + x2 = 0 + -4

Combine like terms: 0 + -4 = -4
3.5x + x2 = -4

The x term is 3.5x.  Take half its coefficient (1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
3.5x + 3.0625 + x2 = -4 + 3.0625

Reorder the terms:
3.0625 + 3.5x + x2 = -4 + 3.0625

Combine like terms: -4 + 3.0625 = -0.9375
3.0625 + 3.5x + x2 = -0.9375

Factor a perfect square on the left side:
(x + 1.75)(x + 1.75) = -0.9375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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