20=4+33t-16t^2

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Solution for 20=4+33t-16t^2 equation:


Simplifying
20 = 4 + 33t + -16t2

Solving
20 = 4 + 33t + -16t2

Solving for variable 't'.

Combine like terms: 20 + -4 = 16
16 + -33t + 16t2 = 4 + 33t + -16t2 + -4 + -33t + 16t2

Reorder the terms:
16 + -33t + 16t2 = 4 + -4 + 33t + -33t + -16t2 + 16t2

Combine like terms: 4 + -4 = 0
16 + -33t + 16t2 = 0 + 33t + -33t + -16t2 + 16t2
16 + -33t + 16t2 = 33t + -33t + -16t2 + 16t2

Combine like terms: 33t + -33t = 0
16 + -33t + 16t2 = 0 + -16t2 + 16t2
16 + -33t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
16 + -33t + 16t2 = 0

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

Divide each side by '16'.
1 + -2.0625t + t2 = 0

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + -2.0625t + -1 + t2 = 0 + -1

Reorder the terms:
1 + -1 + -2.0625t + t2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -2.0625t + t2 = 0 + -1
-2.0625t + t2 = 0 + -1

Combine like terms: 0 + -1 = -1
-2.0625t + t2 = -1

The t term is -2.0625t.  Take half its coefficient (-1.03125).
Square it (1.063476563) and add it to both sides.

Add '1.063476563' to each side of the equation.
-2.0625t + 1.063476563 + t2 = -1 + 1.063476563

Reorder the terms:
1.063476563 + -2.0625t + t2 = -1 + 1.063476563

Combine like terms: -1 + 1.063476563 = 0.063476563
1.063476563 + -2.0625t + t2 = 0.063476563

Factor a perfect square on the left side:
(t + -1.03125)(t + -1.03125) = 0.063476563

Calculate the square root of the right side: 0.251945556

Break this problem into two subproblems by setting 
(t + -1.03125) equal to 0.251945556 and -0.251945556.

Subproblem 1

t + -1.03125 = 0.251945556 Simplifying t + -1.03125 = 0.251945556 Reorder the terms: -1.03125 + t = 0.251945556 Solving -1.03125 + t = 0.251945556 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.03125' to each side of the equation. -1.03125 + 1.03125 + t = 0.251945556 + 1.03125 Combine like terms: -1.03125 + 1.03125 = 0.00000 0.00000 + t = 0.251945556 + 1.03125 t = 0.251945556 + 1.03125 Combine like terms: 0.251945556 + 1.03125 = 1.283195556 t = 1.283195556 Simplifying t = 1.283195556

Subproblem 2

t + -1.03125 = -0.251945556 Simplifying t + -1.03125 = -0.251945556 Reorder the terms: -1.03125 + t = -0.251945556 Solving -1.03125 + t = -0.251945556 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.03125' to each side of the equation. -1.03125 + 1.03125 + t = -0.251945556 + 1.03125 Combine like terms: -1.03125 + 1.03125 = 0.00000 0.00000 + t = -0.251945556 + 1.03125 t = -0.251945556 + 1.03125 Combine like terms: -0.251945556 + 1.03125 = 0.779304444 t = 0.779304444 Simplifying t = 0.779304444

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.283195556, 0.779304444}

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