35=-16t^2+42t+82

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Solution for 35=-16t^2+42t+82 equation:


Simplifying
35 = -16t2 + 42t + 82

Reorder the terms:
35 = 82 + 42t + -16t2

Solving
35 = 82 + 42t + -16t2

Solving for variable 't'.

Combine like terms: 35 + -82 = -47
-47 + -42t + 16t2 = 82 + 42t + -16t2 + -82 + -42t + 16t2

Reorder the terms:
-47 + -42t + 16t2 = 82 + -82 + 42t + -42t + -16t2 + 16t2

Combine like terms: 82 + -82 = 0
-47 + -42t + 16t2 = 0 + 42t + -42t + -16t2 + 16t2
-47 + -42t + 16t2 = 42t + -42t + -16t2 + 16t2

Combine like terms: 42t + -42t = 0
-47 + -42t + 16t2 = 0 + -16t2 + 16t2
-47 + -42t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
-47 + -42t + 16t2 = 0

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

Divide each side by '16'.
-2.9375 + -2.625t + t2 = 0

Move the constant term to the right:

Add '2.9375' to each side of the equation.
-2.9375 + -2.625t + 2.9375 + t2 = 0 + 2.9375

Reorder the terms:
-2.9375 + 2.9375 + -2.625t + t2 = 0 + 2.9375

Combine like terms: -2.9375 + 2.9375 = 0.0000
0.0000 + -2.625t + t2 = 0 + 2.9375
-2.625t + t2 = 0 + 2.9375

Combine like terms: 0 + 2.9375 = 2.9375
-2.625t + t2 = 2.9375

The t term is -2.625t.  Take half its coefficient (-1.3125).
Square it (1.72265625) and add it to both sides.

Add '1.72265625' to each side of the equation.
-2.625t + 1.72265625 + t2 = 2.9375 + 1.72265625

Reorder the terms:
1.72265625 + -2.625t + t2 = 2.9375 + 1.72265625

Combine like terms: 2.9375 + 1.72265625 = 4.66015625
1.72265625 + -2.625t + t2 = 4.66015625

Factor a perfect square on the left side:
(t + -1.3125)(t + -1.3125) = 4.66015625

Calculate the square root of the right side: 2.158739505

Break this problem into two subproblems by setting 
(t + -1.3125) equal to 2.158739505 and -2.158739505.

Subproblem 1

t + -1.3125 = 2.158739505 Simplifying t + -1.3125 = 2.158739505 Reorder the terms: -1.3125 + t = 2.158739505 Solving -1.3125 + t = 2.158739505 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.3125' to each side of the equation. -1.3125 + 1.3125 + t = 2.158739505 + 1.3125 Combine like terms: -1.3125 + 1.3125 = 0.0000 0.0000 + t = 2.158739505 + 1.3125 t = 2.158739505 + 1.3125 Combine like terms: 2.158739505 + 1.3125 = 3.471239505 t = 3.471239505 Simplifying t = 3.471239505

Subproblem 2

t + -1.3125 = -2.158739505 Simplifying t + -1.3125 = -2.158739505 Reorder the terms: -1.3125 + t = -2.158739505 Solving -1.3125 + t = -2.158739505 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.3125' to each side of the equation. -1.3125 + 1.3125 + t = -2.158739505 + 1.3125 Combine like terms: -1.3125 + 1.3125 = 0.0000 0.0000 + t = -2.158739505 + 1.3125 t = -2.158739505 + 1.3125 Combine like terms: -2.158739505 + 1.3125 = -0.846239505 t = -0.846239505 Simplifying t = -0.846239505

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.471239505, -0.846239505}

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