-4.9t*t-39.2t-98=0

Solution for -4.9t*t-39.2t-98=0 equation:

Simplifying
-4.9t * t + -39.2t + -98 = 0

Multiply t * t
-4.9t2 + -39.2t + -98 = 0

Reorder the terms:
-98 + -39.2t + -4.9t2 = 0

Solving
-98 + -39.2t + -4.9t2 = 0

Solving for variable 't'.

Begin completing the square.  Divide all terms by
-4.9 the coefficient of the squared term: 

Divide each side by '-4.9'.
20 + 8t + t2 = 0

Move the constant term to the right:

Add '-20' to each side of the equation.
20 + 8t + -20 + t2 = 0 + -20

Reorder the terms:
20 + -20 + 8t + t2 = 0 + -20

Combine like terms: 20 + -20 = 0
0 + 8t + t2 = 0 + -20
8t + t2 = 0 + -20

Combine like terms: 0 + -20 = -20
8t + t2 = -20

The t term is 8t.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8t + 16 + t2 = -20 + 16

Reorder the terms:
16 + 8t + t2 = -20 + 16

Combine like terms: -20 + 16 = -4
16 + 8t + t2 = -4

Factor a perfect square on the left side:
(t + 4)(t + 4) = -4

Can't calculate square root of the right side.

The solution to this equation could not be determined.