.625=-16t^2+20t

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Solution for .625=-16t^2+20t equation:


Simplifying
0.625 = -16t2 + 20t

Reorder the terms:
0.625 = 20t + -16t2

Solving
0.625 = 20t + -16t2

Solving for variable 't'.

Reorder the terms:
0.625 + -20t + 16t2 = 20t + -20t + -16t2 + 16t2

Combine like terms: 20t + -20t = 0
0.625 + -20t + 16t2 = 0 + -16t2 + 16t2
0.625 + -20t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
0.625 + -20t + 16t2 = 0

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

Divide each side by '16'.
0.0390625 + -1.25t + t2 = 0

Move the constant term to the right:

Add '-0.0390625' to each side of the equation.
0.0390625 + -1.25t + -0.0390625 + t2 = 0 + -0.0390625

Reorder the terms:
0.0390625 + -0.0390625 + -1.25t + t2 = 0 + -0.0390625

Combine like terms: 0.0390625 + -0.0390625 = 0.0000000
0.0000000 + -1.25t + t2 = 0 + -0.0390625
-1.25t + t2 = 0 + -0.0390625

Combine like terms: 0 + -0.0390625 = -0.0390625
-1.25t + t2 = -0.0390625

The t term is -1.25t.  Take half its coefficient (-0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
-1.25t + 0.390625 + t2 = -0.0390625 + 0.390625

Reorder the terms:
0.390625 + -1.25t + t2 = -0.0390625 + 0.390625

Combine like terms: -0.0390625 + 0.390625 = 0.3515625
0.390625 + -1.25t + t2 = 0.3515625

Factor a perfect square on the left side:
(t + -0.625)(t + -0.625) = 0.3515625

Calculate the square root of the right side: 0.592927061

Break this problem into two subproblems by setting 
(t + -0.625) equal to 0.592927061 and -0.592927061.

Subproblem 1

t + -0.625 = 0.592927061 Simplifying t + -0.625 = 0.592927061 Reorder the terms: -0.625 + t = 0.592927061 Solving -0.625 + t = 0.592927061 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + t = 0.592927061 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + t = 0.592927061 + 0.625 t = 0.592927061 + 0.625 Combine like terms: 0.592927061 + 0.625 = 1.217927061 t = 1.217927061 Simplifying t = 1.217927061

Subproblem 2

t + -0.625 = -0.592927061 Simplifying t + -0.625 = -0.592927061 Reorder the terms: -0.625 + t = -0.592927061 Solving -0.625 + t = -0.592927061 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + t = -0.592927061 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + t = -0.592927061 + 0.625 t = -0.592927061 + 0.625 Combine like terms: -0.592927061 + 0.625 = 0.032072939 t = 0.032072939 Simplifying t = 0.032072939

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.217927061, 0.032072939}

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