3=4t-5*t*t

Solution for 3=4t-5*t*t equation:

Simplifying
3 = 4t + -5t * t

Multiply t * t
3 = 4t + -5t2

Solving
3 = 4t + -5t2

Solving for variable 't'.

Reorder the terms:
3 + -4t + 5t2 = 4t + -4t + -5t2 + 5t2

Combine like terms: 4t + -4t = 0
3 + -4t + 5t2 = 0 + -5t2 + 5t2
3 + -4t + 5t2 = -5t2 + 5t2

Combine like terms: -5t2 + 5t2 = 0
3 + -4t + 5t2 = 0

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

Divide each side by '5'.
0.6 + -0.8t + t2 = 0

Move the constant term to the right:

Add '-0.6' to each side of the equation.
0.6 + -0.8t + -0.6 + t2 = 0 + -0.6

Reorder the terms:
0.6 + -0.6 + -0.8t + t2 = 0 + -0.6

Combine like terms: 0.6 + -0.6 = 0.0
0.0 + -0.8t + t2 = 0 + -0.6
-0.8t + t2 = 0 + -0.6

Combine like terms: 0 + -0.6 = -0.6
-0.8t + t2 = -0.6

The t term is -0.8t.  Take half its coefficient (-0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
-0.8t + 0.16 + t2 = -0.6 + 0.16

Reorder the terms:
0.16 + -0.8t + t2 = -0.6 + 0.16

Combine like terms: -0.6 + 0.16 = -0.44
0.16 + -0.8t + t2 = -0.44

Factor a perfect square on the left side:
(t + -0.4)(t + -0.4) = -0.44

Can't calculate square root of the right side.

The solution to this equation could not be determined.