5a^2+2a=-9

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Solution for 5a^2+2a=-9 equation:


Simplifying
5a2 + 2a = -9

Reorder the terms:
2a + 5a2 = -9

Solving
2a + 5a2 = -9

Solving for variable 'a'.

Reorder the terms:
9 + 2a + 5a2 = -9 + 9

Combine like terms: -9 + 9 = 0
9 + 2a + 5a2 = 0

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

Divide each side by '5'.
1.8 + 0.4a + a2 = 0

Move the constant term to the right:

Add '-1.8' to each side of the equation.
1.8 + 0.4a + -1.8 + a2 = 0 + -1.8

Reorder the terms:
1.8 + -1.8 + 0.4a + a2 = 0 + -1.8

Combine like terms: 1.8 + -1.8 = 0.0
0.0 + 0.4a + a2 = 0 + -1.8
0.4a + a2 = 0 + -1.8

Combine like terms: 0 + -1.8 = -1.8
0.4a + a2 = -1.8

The a term is 0.4a.  Take half its coefficient (0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
0.4a + 0.04 + a2 = -1.8 + 0.04

Reorder the terms:
0.04 + 0.4a + a2 = -1.8 + 0.04

Combine like terms: -1.8 + 0.04 = -1.76
0.04 + 0.4a + a2 = -1.76

Factor a perfect square on the left side:
(a + 0.2)(a + 0.2) = -1.76

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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