10=-t^2+20t-20

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Solution for 10=-t^2+20t-20 equation:


Simplifying
10 = -1t2 + 20t + -20

Reorder the terms:
10 = -20 + 20t + -1t2

Solving
10 = -20 + 20t + -1t2

Solving for variable 't'.

Combine like terms: 10 + 20 = 30
30 + -20t + t2 = -20 + 20t + -1t2 + 20 + -20t + t2

Reorder the terms:
30 + -20t + t2 = -20 + 20 + 20t + -20t + -1t2 + t2

Combine like terms: -20 + 20 = 0
30 + -20t + t2 = 0 + 20t + -20t + -1t2 + t2
30 + -20t + t2 = 20t + -20t + -1t2 + t2

Combine like terms: 20t + -20t = 0
30 + -20t + t2 = 0 + -1t2 + t2
30 + -20t + t2 = -1t2 + t2

Combine like terms: -1t2 + t2 = 0
30 + -20t + t2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-30' to each side of the equation.
30 + -20t + -30 + t2 = 0 + -30

Reorder the terms:
30 + -30 + -20t + t2 = 0 + -30

Combine like terms: 30 + -30 = 0
0 + -20t + t2 = 0 + -30
-20t + t2 = 0 + -30

Combine like terms: 0 + -30 = -30
-20t + t2 = -30

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 = -30 + 100

Reorder the terms:
100 + -20t + t2 = -30 + 100

Combine like terms: -30 + 100 = 70
100 + -20t + t2 = 70

Factor a perfect square on the left side:
(t + -10)(t + -10) = 70

Calculate the square root of the right side: 8.366600265

Break this problem into two subproblems by setting 
(t + -10) equal to 8.366600265 and -8.366600265.

Subproblem 1

t + -10 = 8.366600265 Simplifying t + -10 = 8.366600265 Reorder the terms: -10 + t = 8.366600265 Solving -10 + t = 8.366600265 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 = 8.366600265 + 10 Combine like terms: -10 + 10 = 0 0 + t = 8.366600265 + 10 t = 8.366600265 + 10 Combine like terms: 8.366600265 + 10 = 18.366600265 t = 18.366600265 Simplifying t = 18.366600265

Subproblem 2

t + -10 = -8.366600265 Simplifying t + -10 = -8.366600265 Reorder the terms: -10 + t = -8.366600265 Solving -10 + t = -8.366600265 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 = -8.366600265 + 10 Combine like terms: -10 + 10 = 0 0 + t = -8.366600265 + 10 t = -8.366600265 + 10 Combine like terms: -8.366600265 + 10 = 1.633399735 t = 1.633399735 Simplifying t = 1.633399735

Solution

The solution to the problem is based on the solutions from the subproblems. t = {18.366600265, 1.633399735}

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