=4x^2-x+9

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Solution for =4x^2-x+9 equation:


Simplifying
0 = 4x2 + -1x + 9

Reorder the terms:
0 = 9 + -1x + 4x2

Solving
0 = 9 + -1x + 4x2

Solving for variable 'x'.

Combine like terms: 0 + -9 = -9
-9 + x + -4x2 = 9 + -1x + 4x2 + -9 + x + -4x2

Reorder the terms:
-9 + x + -4x2 = 9 + -9 + -1x + x + 4x2 + -4x2

Combine like terms: 9 + -9 = 0
-9 + x + -4x2 = 0 + -1x + x + 4x2 + -4x2
-9 + x + -4x2 = -1x + x + 4x2 + -4x2

Combine like terms: -1x + x = 0
-9 + x + -4x2 = 0 + 4x2 + -4x2
-9 + x + -4x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
-9 + x + -4x2 = 0

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

Divide each side by '-4'.
2.25 + -0.25x + x2 = 0

Move the constant term to the right:

Add '-2.25' to each side of the equation.
2.25 + -0.25x + -2.25 + x2 = 0 + -2.25

Reorder the terms:
2.25 + -2.25 + -0.25x + x2 = 0 + -2.25

Combine like terms: 2.25 + -2.25 = 0.00
0.00 + -0.25x + x2 = 0 + -2.25
-0.25x + x2 = 0 + -2.25

Combine like terms: 0 + -2.25 = -2.25
-0.25x + x2 = -2.25

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.
-0.25x + 0.25 + x2 = -2.25 + 0.25

Reorder the terms:
0.25 + -0.25x + x2 = -2.25 + 0.25

Combine like terms: -2.25 + 0.25 = -2
0.25 + -0.25x + x2 = -2

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = -2

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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