45=-16t^2+5t+105

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Solution for 45=-16t^2+5t+105 equation:


Simplifying
45 = -16t2 + 5t + 105

Reorder the terms:
45 = 105 + 5t + -16t2

Solving
45 = 105 + 5t + -16t2

Solving for variable 't'.

Combine like terms: 45 + -105 = -60
-60 + -5t + 16t2 = 105 + 5t + -16t2 + -105 + -5t + 16t2

Reorder the terms:
-60 + -5t + 16t2 = 105 + -105 + 5t + -5t + -16t2 + 16t2

Combine like terms: 105 + -105 = 0
-60 + -5t + 16t2 = 0 + 5t + -5t + -16t2 + 16t2
-60 + -5t + 16t2 = 5t + -5t + -16t2 + 16t2

Combine like terms: 5t + -5t = 0
-60 + -5t + 16t2 = 0 + -16t2 + 16t2
-60 + -5t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
-60 + -5t + 16t2 = 0

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

Divide each side by '16'.
-3.75 + -0.3125t + t2 = 0

Move the constant term to the right:

Add '3.75' to each side of the equation.
-3.75 + -0.3125t + 3.75 + t2 = 0 + 3.75

Reorder the terms:
-3.75 + 3.75 + -0.3125t + t2 = 0 + 3.75

Combine like terms: -3.75 + 3.75 = 0.00
0.00 + -0.3125t + t2 = 0 + 3.75
-0.3125t + t2 = 0 + 3.75

Combine like terms: 0 + 3.75 = 3.75
-0.3125t + t2 = 3.75

The t term is -0.3125t.  Take half its coefficient (-0.15625).
Square it (0.0244140625) and add it to both sides.

Add '0.0244140625' to each side of the equation.
-0.3125t + 0.0244140625 + t2 = 3.75 + 0.0244140625

Reorder the terms:
0.0244140625 + -0.3125t + t2 = 3.75 + 0.0244140625

Combine like terms: 3.75 + 0.0244140625 = 3.7744140625
0.0244140625 + -0.3125t + t2 = 3.7744140625

Factor a perfect square on the left side:
(t + -0.15625)(t + -0.15625) = 3.7744140625

Calculate the square root of the right side: 1.94278513

Break this problem into two subproblems by setting 
(t + -0.15625) equal to 1.94278513 and -1.94278513.

Subproblem 1

t + -0.15625 = 1.94278513 Simplifying t + -0.15625 = 1.94278513 Reorder the terms: -0.15625 + t = 1.94278513 Solving -0.15625 + t = 1.94278513 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.15625' to each side of the equation. -0.15625 + 0.15625 + t = 1.94278513 + 0.15625 Combine like terms: -0.15625 + 0.15625 = 0.00000 0.00000 + t = 1.94278513 + 0.15625 t = 1.94278513 + 0.15625 Combine like terms: 1.94278513 + 0.15625 = 2.09903513 t = 2.09903513 Simplifying t = 2.09903513

Subproblem 2

t + -0.15625 = -1.94278513 Simplifying t + -0.15625 = -1.94278513 Reorder the terms: -0.15625 + t = -1.94278513 Solving -0.15625 + t = -1.94278513 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.15625' to each side of the equation. -0.15625 + 0.15625 + t = -1.94278513 + 0.15625 Combine like terms: -0.15625 + 0.15625 = 0.00000 0.00000 + t = -1.94278513 + 0.15625 t = -1.94278513 + 0.15625 Combine like terms: -1.94278513 + 0.15625 = -1.78653513 t = -1.78653513 Simplifying t = -1.78653513

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.09903513, -1.78653513}

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