2.5=0.01x^2-x+28

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Solution for 2.5=0.01x^2-x+28 equation:


Simplifying
2.5 = 0.01x2 + -1x + 28

Reorder the terms:
2.5 = 28 + -1x + 0.01x2

Solving
2.5 = 28 + -1x + 0.01x2

Solving for variable 'x'.

Combine like terms: 2.5 + -28 = -25.5
-25.5 + x + -0.01x2 = 28 + -1x + 0.01x2 + -28 + x + -0.01x2

Reorder the terms:
-25.5 + x + -0.01x2 = 28 + -28 + -1x + x + 0.01x2 + -0.01x2

Combine like terms: 28 + -28 = 0
-25.5 + x + -0.01x2 = 0 + -1x + x + 0.01x2 + -0.01x2
-25.5 + x + -0.01x2 = -1x + x + 0.01x2 + -0.01x2

Combine like terms: -1x + x = 0
-25.5 + x + -0.01x2 = 0 + 0.01x2 + -0.01x2
-25.5 + x + -0.01x2 = 0.01x2 + -0.01x2

Combine like terms: 0.01x2 + -0.01x2 = 0.00
-25.5 + x + -0.01x2 = 0.00

Begin completing the square.  Divide all terms by
-0.01 the coefficient of the squared term: 

Divide each side by '-0.01'.
2550 + -100x + x2 = 0

Move the constant term to the right:

Add '-2550' to each side of the equation.
2550 + -100x + -2550 + x2 = 0 + -2550

Reorder the terms:
2550 + -2550 + -100x + x2 = 0 + -2550

Combine like terms: 2550 + -2550 = 0
0 + -100x + x2 = 0 + -2550
-100x + x2 = 0 + -2550

Combine like terms: 0 + -2550 = -2550
-100x + x2 = -2550

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-100x + 0.25 + x2 = -2550 + 0.25

Reorder the terms:
0.25 + -100x + x2 = -2550 + 0.25

Combine like terms: -2550 + 0.25 = -2549.75
0.25 + -100x + x2 = -2549.75

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = -2549.75

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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