220=30t+(.5)(-9.8)t^2

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Solution for 220=30t+(.5)(-9.8)t^2 equation:


Simplifying
220 = 30t + (0.5)(-9.8) * t2

Multiply 0.5 * -9.8
220 = 30t + -4.9t2

Solving
220 = 30t + -4.9t2

Solving for variable 't'.

Reorder the terms:
220 + -30t + 4.9t2 = 30t + -30t + -4.9t2 + 4.9t2

Combine like terms: 30t + -30t = 0
220 + -30t + 4.9t2 = 0 + -4.9t2 + 4.9t2
220 + -30t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
220 + -30t + 4.9t2 = 0.0

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

Divide each side by '4.9'.
44.89795918 + -6.12244898t + t2 = 0

Move the constant term to the right:

Add '-44.89795918' to each side of the equation.
44.89795918 + -6.12244898t + -44.89795918 + t2 = 0 + -44.89795918

Reorder the terms:
44.89795918 + -44.89795918 + -6.12244898t + t2 = 0 + -44.89795918

Combine like terms: 44.89795918 + -44.89795918 = 0.00000000
0.00000000 + -6.12244898t + t2 = 0 + -44.89795918
-6.12244898t + t2 = 0 + -44.89795918

Combine like terms: 0 + -44.89795918 = -44.89795918
-6.12244898t + t2 = -44.89795918

The t term is -6.12244898t.  Take half its coefficient (-3.06122449).
Square it (9.371095378) and add it to both sides.

Add '9.371095378' to each side of the equation.
-6.12244898t + 9.371095378 + t2 = -44.89795918 + 9.371095378

Reorder the terms:
9.371095378 + -6.12244898t + t2 = -44.89795918 + 9.371095378

Combine like terms: -44.89795918 + 9.371095378 = -35.526863802
9.371095378 + -6.12244898t + t2 = -35.526863802

Factor a perfect square on the left side:
(t + -3.06122449)(t + -3.06122449) = -35.526863802

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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