20=-0.25t^2+5t

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Solution for 20=-0.25t^2+5t equation:


Simplifying
20 = -0.25t2 + 5t

Reorder the terms:
20 = 5t + -0.25t2

Solving
20 = 5t + -0.25t2

Solving for variable 't'.

Reorder the terms:
20 + -5t + 0.25t2 = 5t + -5t + -0.25t2 + 0.25t2

Combine like terms: 5t + -5t = 0
20 + -5t + 0.25t2 = 0 + -0.25t2 + 0.25t2
20 + -5t + 0.25t2 = -0.25t2 + 0.25t2

Combine like terms: -0.25t2 + 0.25t2 = 0.00
20 + -5t + 0.25t2 = 0.00

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

Divide each side by '0.25'.
80 + -20t + t2 = 0

Move the constant term to the right:

Add '-80' to each side of the equation.
80 + -20t + -80 + t2 = 0 + -80

Reorder the terms:
80 + -80 + -20t + t2 = 0 + -80

Combine like terms: 80 + -80 = 0
0 + -20t + t2 = 0 + -80
-20t + t2 = 0 + -80

Combine like terms: 0 + -80 = -80
-20t + t2 = -80

The t term is -20t.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20t + 100 + t2 = -80 + 100

Reorder the terms:
100 + -20t + t2 = -80 + 100

Combine like terms: -80 + 100 = 20
100 + -20t + t2 = 20

Factor a perfect square on the left side:
(t + -10)(t + -10) = 20

Calculate the square root of the right side: 4.472135955

Break this problem into two subproblems by setting 
(t + -10) equal to 4.472135955 and -4.472135955.

Subproblem 1

t + -10 = 4.472135955 Simplifying t + -10 = 4.472135955 Reorder the terms: -10 + t = 4.472135955 Solving -10 + t = 4.472135955 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + t = 4.472135955 + 10 Combine like terms: -10 + 10 = 0 0 + t = 4.472135955 + 10 t = 4.472135955 + 10 Combine like terms: 4.472135955 + 10 = 14.472135955 t = 14.472135955 Simplifying t = 14.472135955

Subproblem 2

t + -10 = -4.472135955 Simplifying t + -10 = -4.472135955 Reorder the terms: -10 + t = -4.472135955 Solving -10 + t = -4.472135955 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + t = -4.472135955 + 10 Combine like terms: -10 + 10 = 0 0 + t = -4.472135955 + 10 t = -4.472135955 + 10 Combine like terms: -4.472135955 + 10 = 5.527864045 t = 5.527864045 Simplifying t = 5.527864045

Solution

The solution to the problem is based on the solutions from the subproblems. t = {14.472135955, 5.527864045}

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