9x-15=2x^2

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Solution for 9x-15=2x^2 equation:


Simplifying
9x + -15 = 2x2

Reorder the terms:
-15 + 9x = 2x2

Solving
-15 + 9x = 2x2

Solving for variable 'x'.

Combine like terms: 2x2 + -2x2 = 0
-15 + 9x + -2x2 = 0

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
7.5 + -4.5x + x2 = 0

Move the constant term to the right:

Add '-7.5' to each side of the equation.
7.5 + -4.5x + -7.5 + x2 = 0 + -7.5

Reorder the terms:
7.5 + -7.5 + -4.5x + x2 = 0 + -7.5

Combine like terms: 7.5 + -7.5 = 0.0
0.0 + -4.5x + x2 = 0 + -7.5
-4.5x + x2 = 0 + -7.5

Combine like terms: 0 + -7.5 = -7.5
-4.5x + x2 = -7.5

The x term is -4.5x.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5x + 5.0625 + x2 = -7.5 + 5.0625

Reorder the terms:
5.0625 + -4.5x + x2 = -7.5 + 5.0625

Combine like terms: -7.5 + 5.0625 = -2.4375
5.0625 + -4.5x + x2 = -2.4375

Factor a perfect square on the left side:
(x + -2.25)(x + -2.25) = -2.4375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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