3x^2-15x+56.25=0

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Solution for 3x^2-15x+56.25=0 equation:


Simplifying
3x2 + -15x + 56.25 = 0

Reorder the terms:
56.25 + -15x + 3x2 = 0

Solving
56.25 + -15x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
18.75 + -5x + x2 = 0

Move the constant term to the right:

Add '-18.75' to each side of the equation.
18.75 + -5x + -18.75 + x2 = 0 + -18.75

Reorder the terms:
18.75 + -18.75 + -5x + x2 = 0 + -18.75

Combine like terms: 18.75 + -18.75 = 0.00
0.00 + -5x + x2 = 0 + -18.75
-5x + x2 = 0 + -18.75

Combine like terms: 0 + -18.75 = -18.75
-5x + x2 = -18.75

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = -18.75 + 6.25

Reorder the terms:
6.25 + -5x + x2 = -18.75 + 6.25

Combine like terms: -18.75 + 6.25 = -12.5
6.25 + -5x + x2 = -12.5

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = -12.5

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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