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

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


Simplifying
t = -5t2 + 20t + 60

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

Solving
t = 60 + 20t + -5t2

Solving for variable 't'.

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

Combine like terms: t + -20t = -19t
-60 + -19t + 5t2 = 60 + 20t + -5t2 + -60 + -20t + 5t2

Reorder the terms:
-60 + -19t + 5t2 = 60 + -60 + 20t + -20t + -5t2 + 5t2

Combine like terms: 60 + -60 = 0
-60 + -19t + 5t2 = 0 + 20t + -20t + -5t2 + 5t2
-60 + -19t + 5t2 = 20t + -20t + -5t2 + 5t2

Combine like terms: 20t + -20t = 0
-60 + -19t + 5t2 = 0 + -5t2 + 5t2
-60 + -19t + 5t2 = -5t2 + 5t2

Combine like terms: -5t2 + 5t2 = 0
-60 + -19t + 5t2 = 0

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

Divide each side by '5'.
-12 + -3.8t + t2 = 0

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + -3.8t + 12 + t2 = 0 + 12

Reorder the terms:
-12 + 12 + -3.8t + t2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -3.8t + t2 = 0 + 12
-3.8t + t2 = 0 + 12

Combine like terms: 0 + 12 = 12
-3.8t + t2 = 12

The t term is -3.8t.  Take half its coefficient (-1.9).
Square it (3.61) and add it to both sides.

Add '3.61' to each side of the equation.
-3.8t + 3.61 + t2 = 12 + 3.61

Reorder the terms:
3.61 + -3.8t + t2 = 12 + 3.61

Combine like terms: 12 + 3.61 = 15.61
3.61 + -3.8t + t2 = 15.61

Factor a perfect square on the left side:
(t + -1.9)(t + -1.9) = 15.61

Calculate the square root of the right side: 3.950949253

Break this problem into two subproblems by setting 
(t + -1.9) equal to 3.950949253 and -3.950949253.

Subproblem 1

t + -1.9 = 3.950949253 Simplifying t + -1.9 = 3.950949253 Reorder the terms: -1.9 + t = 3.950949253 Solving -1.9 + t = 3.950949253 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.9' to each side of the equation. -1.9 + 1.9 + t = 3.950949253 + 1.9 Combine like terms: -1.9 + 1.9 = 0.0 0.0 + t = 3.950949253 + 1.9 t = 3.950949253 + 1.9 Combine like terms: 3.950949253 + 1.9 = 5.850949253 t = 5.850949253 Simplifying t = 5.850949253

Subproblem 2

t + -1.9 = -3.950949253 Simplifying t + -1.9 = -3.950949253 Reorder the terms: -1.9 + t = -3.950949253 Solving -1.9 + t = -3.950949253 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.9' to each side of the equation. -1.9 + 1.9 + t = -3.950949253 + 1.9 Combine like terms: -1.9 + 1.9 = 0.0 0.0 + t = -3.950949253 + 1.9 t = -3.950949253 + 1.9 Combine like terms: -3.950949253 + 1.9 = -2.050949253 t = -2.050949253 Simplifying t = -2.050949253

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.850949253, -2.050949253}

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