(-4.905x^2)+12x-40=0

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Solution for (-4.905x^2)+12x-40=0 equation:


Simplifying
(-4.905x2) + 12x + -40 = 0

Reorder the terms:
-40 + 12x + (-4.905x2) = 0

Solving
-40 + 12x + (-4.905x2) = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-4.905 the coefficient of the squared term: 

Divide each side by '-4.905'.
8.154943935 + -2.44648318x + x2 = 0

Move the constant term to the right:

Add '-8.154943935' to each side of the equation.
8.154943935 + -2.44648318x + -8.154943935 + x2 = 0 + -8.154943935

Reorder the terms:
8.154943935 + -8.154943935 + -2.44648318x + x2 = 0 + -8.154943935

Combine like terms: 8.154943935 + -8.154943935 = 0.000000000
0.000000000 + -2.44648318x + x2 = 0 + -8.154943935
-2.44648318x + x2 = 0 + -8.154943935

Combine like terms: 0 + -8.154943935 = -8.154943935
-2.44648318x + x2 = -8.154943935

The x term is -2.44648318x.  Take half its coefficient (-1.22324159).
Square it (1.496319988) and add it to both sides.

Add '1.496319988' to each side of the equation.
-2.44648318x + 1.496319988 + x2 = -8.154943935 + 1.496319988

Reorder the terms:
1.496319988 + -2.44648318x + x2 = -8.154943935 + 1.496319988

Combine like terms: -8.154943935 + 1.496319988 = -6.658623947
1.496319988 + -2.44648318x + x2 = -6.658623947

Factor a perfect square on the left side:
((x) + -1.22324159)((x) + -1.22324159) = -6.658623947

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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