x=.64x^2-7.68x+31

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Solution for x=.64x^2-7.68x+31 equation:


Simplifying
x = 0.64x2 + -7.68x + 31

Reorder the terms:
x = 31 + -7.68x + 0.64x2

Solving
x = 31 + -7.68x + 0.64x2

Solving for variable 'x'.

Reorder the terms:
-31 + x + 7.68x + -0.64x2 = 31 + -7.68x + 0.64x2 + -31 + 7.68x + -0.64x2

Combine like terms: x + 7.68x = 8.68x
-31 + 8.68x + -0.64x2 = 31 + -7.68x + 0.64x2 + -31 + 7.68x + -0.64x2

Reorder the terms:
-31 + 8.68x + -0.64x2 = 31 + -31 + -7.68x + 7.68x + 0.64x2 + -0.64x2

Combine like terms: 31 + -31 = 0
-31 + 8.68x + -0.64x2 = 0 + -7.68x + 7.68x + 0.64x2 + -0.64x2
-31 + 8.68x + -0.64x2 = -7.68x + 7.68x + 0.64x2 + -0.64x2

Combine like terms: -7.68x + 7.68x = 0.00
-31 + 8.68x + -0.64x2 = 0.00 + 0.64x2 + -0.64x2
-31 + 8.68x + -0.64x2 = 0.64x2 + -0.64x2

Combine like terms: 0.64x2 + -0.64x2 = 0.00
-31 + 8.68x + -0.64x2 = 0.00

Begin completing the square.  Divide all terms by
-0.64 the coefficient of the squared term: 

Divide each side by '-0.64'.
48.4375 + -13.5625x + x2 = 0

Move the constant term to the right:

Add '-48.4375' to each side of the equation.
48.4375 + -13.5625x + -48.4375 + x2 = 0 + -48.4375

Reorder the terms:
48.4375 + -48.4375 + -13.5625x + x2 = 0 + -48.4375

Combine like terms: 48.4375 + -48.4375 = 0.0000
0.0000 + -13.5625x + x2 = 0 + -48.4375
-13.5625x + x2 = 0 + -48.4375

Combine like terms: 0 + -48.4375 = -48.4375
-13.5625x + x2 = -48.4375

The x term is -13.5625x.  Take half its coefficient (-6.78125).
Square it (45.98535156) and add it to both sides.

Add '45.98535156' to each side of the equation.
-13.5625x + 45.98535156 + x2 = -48.4375 + 45.98535156

Reorder the terms:
45.98535156 + -13.5625x + x2 = -48.4375 + 45.98535156

Combine like terms: -48.4375 + 45.98535156 = -2.45214844
45.98535156 + -13.5625x + x2 = -2.45214844

Factor a perfect square on the left side:
(x + -6.78125)(x + -6.78125) = -2.45214844

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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