81=-12t-5t^2

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Solution for 81=-12t-5t^2 equation:


Simplifying
81 = -12t + -5t2

Solving
81 = -12t + -5t2

Solving for variable 't'.

Reorder the terms:
81 + 12t + 5t2 = -12t + 12t + -5t2 + 5t2

Combine like terms: -12t + 12t = 0
81 + 12t + 5t2 = 0 + -5t2 + 5t2
81 + 12t + 5t2 = -5t2 + 5t2

Combine like terms: -5t2 + 5t2 = 0
81 + 12t + 5t2 = 0

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

Divide each side by '5'.
16.2 + 2.4t + t2 = 0

Move the constant term to the right:

Add '-16.2' to each side of the equation.
16.2 + 2.4t + -16.2 + t2 = 0 + -16.2

Reorder the terms:
16.2 + -16.2 + 2.4t + t2 = 0 + -16.2

Combine like terms: 16.2 + -16.2 = 0.0
0.0 + 2.4t + t2 = 0 + -16.2
2.4t + t2 = 0 + -16.2

Combine like terms: 0 + -16.2 = -16.2
2.4t + t2 = -16.2

The t term is 2.4t.  Take half its coefficient (1.2).
Square it (1.44) and add it to both sides.

Add '1.44' to each side of the equation.
2.4t + 1.44 + t2 = -16.2 + 1.44

Reorder the terms:
1.44 + 2.4t + t2 = -16.2 + 1.44

Combine like terms: -16.2 + 1.44 = -14.76
1.44 + 2.4t + t2 = -14.76

Factor a perfect square on the left side:
(t + 1.2)(t + 1.2) = -14.76

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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