4x^2-36x=-85

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Solution for 4x^2-36x=-85 equation:


Simplifying
4x2 + -36x = -85

Reorder the terms:
-36x + 4x2 = -85

Solving
-36x + 4x2 = -85

Solving for variable 'x'.

Reorder the terms:
85 + -36x + 4x2 = -85 + 85

Combine like terms: -85 + 85 = 0
85 + -36x + 4x2 = 0

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

Divide each side by '4'.
21.25 + -9x + x2 = 0

Move the constant term to the right:

Add '-21.25' to each side of the equation.
21.25 + -9x + -21.25 + x2 = 0 + -21.25

Reorder the terms:
21.25 + -21.25 + -9x + x2 = 0 + -21.25

Combine like terms: 21.25 + -21.25 = 0.00
0.00 + -9x + x2 = 0 + -21.25
-9x + x2 = 0 + -21.25

Combine like terms: 0 + -21.25 = -21.25
-9x + x2 = -21.25

The x term is -9x.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9x + 20.25 + x2 = -21.25 + 20.25

Reorder the terms:
20.25 + -9x + x2 = -21.25 + 20.25

Combine like terms: -21.25 + 20.25 = -1
20.25 + -9x + x2 = -1

Factor a perfect square on the left side:
(x + -4.5)(x + -4.5) = -1

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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