140=8t-5t^2

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Solution for 140=8t-5t^2 equation:


Simplifying
140 = 8t + -5t2

Solving
140 = 8t + -5t2

Solving for variable 't'.

Reorder the terms:
140 + -8t + 5t2 = 8t + -8t + -5t2 + 5t2

Combine like terms: 8t + -8t = 0
140 + -8t + 5t2 = 0 + -5t2 + 5t2
140 + -8t + 5t2 = -5t2 + 5t2

Combine like terms: -5t2 + 5t2 = 0
140 + -8t + 5t2 = 0

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

Divide each side by '5'.
28 + -1.6t + t2 = 0

Move the constant term to the right:

Add '-28' to each side of the equation.
28 + -1.6t + -28 + t2 = 0 + -28

Reorder the terms:
28 + -28 + -1.6t + t2 = 0 + -28

Combine like terms: 28 + -28 = 0
0 + -1.6t + t2 = 0 + -28
-1.6t + t2 = 0 + -28

Combine like terms: 0 + -28 = -28
-1.6t + t2 = -28

The t term is -1.6t.  Take half its coefficient (-0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
-1.6t + 0.64 + t2 = -28 + 0.64

Reorder the terms:
0.64 + -1.6t + t2 = -28 + 0.64

Combine like terms: -28 + 0.64 = -27.36
0.64 + -1.6t + t2 = -27.36

Factor a perfect square on the left side:
(t + -0.8)(t + -0.8) = -27.36

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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