20=-16t^2+60t+5

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Solution for 20=-16t^2+60t+5 equation:


Simplifying
20 = -16t2 + 60t + 5

Reorder the terms:
20 = 5 + 60t + -16t2

Solving
20 = 5 + 60t + -16t2

Solving for variable 't'.

Combine like terms: 20 + -5 = 15
15 + -60t + 16t2 = 5 + 60t + -16t2 + -5 + -60t + 16t2

Reorder the terms:
15 + -60t + 16t2 = 5 + -5 + 60t + -60t + -16t2 + 16t2

Combine like terms: 5 + -5 = 0
15 + -60t + 16t2 = 0 + 60t + -60t + -16t2 + 16t2
15 + -60t + 16t2 = 60t + -60t + -16t2 + 16t2

Combine like terms: 60t + -60t = 0
15 + -60t + 16t2 = 0 + -16t2 + 16t2
15 + -60t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
15 + -60t + 16t2 = 0

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

Divide each side by '16'.
0.9375 + -3.75t + t2 = 0

Move the constant term to the right:

Add '-0.9375' to each side of the equation.
0.9375 + -3.75t + -0.9375 + t2 = 0 + -0.9375

Reorder the terms:
0.9375 + -0.9375 + -3.75t + t2 = 0 + -0.9375

Combine like terms: 0.9375 + -0.9375 = 0.0000
0.0000 + -3.75t + t2 = 0 + -0.9375
-3.75t + t2 = 0 + -0.9375

Combine like terms: 0 + -0.9375 = -0.9375
-3.75t + t2 = -0.9375

The t term is -3.75t.  Take half its coefficient (-1.875).
Square it (3.515625) and add it to both sides.

Add '3.515625' to each side of the equation.
-3.75t + 3.515625 + t2 = -0.9375 + 3.515625

Reorder the terms:
3.515625 + -3.75t + t2 = -0.9375 + 3.515625

Combine like terms: -0.9375 + 3.515625 = 2.578125
3.515625 + -3.75t + t2 = 2.578125

Factor a perfect square on the left side:
(t + -1.875)(t + -1.875) = 2.578125

Calculate the square root of the right side: 1.605654072

Break this problem into two subproblems by setting 
(t + -1.875) equal to 1.605654072 and -1.605654072.

Subproblem 1

t + -1.875 = 1.605654072 Simplifying t + -1.875 = 1.605654072 Reorder the terms: -1.875 + t = 1.605654072 Solving -1.875 + t = 1.605654072 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + t = 1.605654072 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + t = 1.605654072 + 1.875 t = 1.605654072 + 1.875 Combine like terms: 1.605654072 + 1.875 = 3.480654072 t = 3.480654072 Simplifying t = 3.480654072

Subproblem 2

t + -1.875 = -1.605654072 Simplifying t + -1.875 = -1.605654072 Reorder the terms: -1.875 + t = -1.605654072 Solving -1.875 + t = -1.605654072 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + t = -1.605654072 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + t = -1.605654072 + 1.875 t = -1.605654072 + 1.875 Combine like terms: -1.605654072 + 1.875 = 0.269345928 t = 0.269345928 Simplifying t = 0.269345928

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.480654072, 0.269345928}

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