-3x^2+13x=15

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Solution for -3x^2+13x=15 equation:


Simplifying
-3x2 + 13x = 15

Reorder the terms:
13x + -3x2 = 15

Solving
13x + -3x2 = 15

Solving for variable 'x'.

Reorder the terms:
-15 + 13x + -3x2 = 15 + -15

Combine like terms: 15 + -15 = 0
-15 + 13x + -3x2 = 0

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

Divide each side by '-3'.
5 + -4.333333333x + x2 = 0

Move the constant term to the right:

Add '-5' to each side of the equation.
5 + -4.333333333x + -5 + x2 = 0 + -5

Reorder the terms:
5 + -5 + -4.333333333x + x2 = 0 + -5

Combine like terms: 5 + -5 = 0
0 + -4.333333333x + x2 = 0 + -5
-4.333333333x + x2 = 0 + -5

Combine like terms: 0 + -5 = -5
-4.333333333x + x2 = -5

The x term is -4.333333333x.  Take half its coefficient (-2.166666667).
Square it (4.694444446) and add it to both sides.

Add '4.694444446' to each side of the equation.
-4.333333333x + 4.694444446 + x2 = -5 + 4.694444446

Reorder the terms:
4.694444446 + -4.333333333x + x2 = -5 + 4.694444446

Combine like terms: -5 + 4.694444446 = -0.305555554
4.694444446 + -4.333333333x + x2 = -0.305555554

Factor a perfect square on the left side:
(x + -2.166666667)(x + -2.166666667) = -0.305555554

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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