10x^2+13x+9=0

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Solution for 10x^2+13x+9=0 equation:


Simplifying
10x2 + 13x + 9 = 0

Reorder the terms:
9 + 13x + 10x2 = 0

Solving
9 + 13x + 10x2 = 0

Solving for variable 'x'.

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

Divide each side by '10'.
0.9 + 1.3x + x2 = 0

Move the constant term to the right:

Add '-0.9' to each side of the equation.
0.9 + 1.3x + -0.9 + x2 = 0 + -0.9

Reorder the terms:
0.9 + -0.9 + 1.3x + x2 = 0 + -0.9

Combine like terms: 0.9 + -0.9 = 0.0
0.0 + 1.3x + x2 = 0 + -0.9
1.3x + x2 = 0 + -0.9

Combine like terms: 0 + -0.9 = -0.9
1.3x + x2 = -0.9

The x term is 1.3x.  Take half its coefficient (0.65).
Square it (0.4225) and add it to both sides.

Add '0.4225' to each side of the equation.
1.3x + 0.4225 + x2 = -0.9 + 0.4225

Reorder the terms:
0.4225 + 1.3x + x2 = -0.9 + 0.4225

Combine like terms: -0.9 + 0.4225 = -0.4775
0.4225 + 1.3x + x2 = -0.4775

Factor a perfect square on the left side:
(x + 0.65)(x + 0.65) = -0.4775

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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