120=-16t^2+85t

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Solution for 120=-16t^2+85t equation:


Simplifying
120 = -16t2 + 85t

Reorder the terms:
120 = 85t + -16t2

Solving
120 = 85t + -16t2

Solving for variable 't'.

Reorder the terms:
120 + -85t + 16t2 = 85t + -85t + -16t2 + 16t2

Combine like terms: 85t + -85t = 0
120 + -85t + 16t2 = 0 + -16t2 + 16t2
120 + -85t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
120 + -85t + 16t2 = 0

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

Divide each side by '16'.
7.5 + -5.3125t + t2 = 0

Move the constant term to the right:

Add '-7.5' to each side of the equation.
7.5 + -5.3125t + -7.5 + t2 = 0 + -7.5

Reorder the terms:
7.5 + -7.5 + -5.3125t + t2 = 0 + -7.5

Combine like terms: 7.5 + -7.5 = 0.0
0.0 + -5.3125t + t2 = 0 + -7.5
-5.3125t + t2 = 0 + -7.5

Combine like terms: 0 + -7.5 = -7.5
-5.3125t + t2 = -7.5

The t term is -5.3125t.  Take half its coefficient (-2.65625).
Square it (7.055664063) and add it to both sides.

Add '7.055664063' to each side of the equation.
-5.3125t + 7.055664063 + t2 = -7.5 + 7.055664063

Reorder the terms:
7.055664063 + -5.3125t + t2 = -7.5 + 7.055664063

Combine like terms: -7.5 + 7.055664063 = -0.444335937
7.055664063 + -5.3125t + t2 = -0.444335937

Factor a perfect square on the left side:
(t + -2.65625)(t + -2.65625) = -0.444335937

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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