5a^2-3a+15=0

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Solution for 5a^2-3a+15=0 equation:


Simplifying
5a2 + -3a + 15 = 0

Reorder the terms:
15 + -3a + 5a2 = 0

Solving
15 + -3a + 5a2 = 0

Solving for variable 'a'.

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

Divide each side by '5'.
3 + -0.6a + a2 = 0

Move the constant term to the right:

Add '-3' to each side of the equation.
3 + -0.6a + -3 + a2 = 0 + -3

Reorder the terms:
3 + -3 + -0.6a + a2 = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -0.6a + a2 = 0 + -3
-0.6a + a2 = 0 + -3

Combine like terms: 0 + -3 = -3
-0.6a + a2 = -3

The a term is -0.6a.  Take half its coefficient (-0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
-0.6a + 0.09 + a2 = -3 + 0.09

Reorder the terms:
0.09 + -0.6a + a2 = -3 + 0.09

Combine like terms: -3 + 0.09 = -2.91
0.09 + -0.6a + a2 = -2.91

Factor a perfect square on the left side:
(a + -0.3)(a + -0.3) = -2.91

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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