25x^2+40x+28=0

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Solution for 25x^2+40x+28=0 equation:


Simplifying
25x2 + 40x + 28 = 0

Reorder the terms:
28 + 40x + 25x2 = 0

Solving
28 + 40x + 25x2 = 0

Solving for variable 'x'.

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

Divide each side by '25'.
1.12 + 1.6x + x2 = 0

Move the constant term to the right:

Add '-1.12' to each side of the equation.
1.12 + 1.6x + -1.12 + x2 = 0 + -1.12

Reorder the terms:
1.12 + -1.12 + 1.6x + x2 = 0 + -1.12

Combine like terms: 1.12 + -1.12 = 0.00
0.00 + 1.6x + x2 = 0 + -1.12
1.6x + x2 = 0 + -1.12

Combine like terms: 0 + -1.12 = -1.12
1.6x + x2 = -1.12

The x term is 1.6x.  Take half its coefficient (0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
1.6x + 0.64 + x2 = -1.12 + 0.64

Reorder the terms:
0.64 + 1.6x + x2 = -1.12 + 0.64

Combine like terms: -1.12 + 0.64 = -0.48
0.64 + 1.6x + x2 = -0.48

Factor a perfect square on the left side:
(x + 0.8)(x + 0.8) = -0.48

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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