12=5+40t-16t^2

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Solution for 12=5+40t-16t^2 equation:


Simplifying
12 = 5 + 40t + -16t2

Solving
12 = 5 + 40t + -16t2

Solving for variable 't'.

Combine like terms: 12 + -5 = 7
7 + -40t + 16t2 = 5 + 40t + -16t2 + -5 + -40t + 16t2

Reorder the terms:
7 + -40t + 16t2 = 5 + -5 + 40t + -40t + -16t2 + 16t2

Combine like terms: 5 + -5 = 0
7 + -40t + 16t2 = 0 + 40t + -40t + -16t2 + 16t2
7 + -40t + 16t2 = 40t + -40t + -16t2 + 16t2

Combine like terms: 40t + -40t = 0
7 + -40t + 16t2 = 0 + -16t2 + 16t2
7 + -40t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
7 + -40t + 16t2 = 0

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

Divide each side by '16'.
0.4375 + -2.5t + t2 = 0

Move the constant term to the right:

Add '-0.4375' to each side of the equation.
0.4375 + -2.5t + -0.4375 + t2 = 0 + -0.4375

Reorder the terms:
0.4375 + -0.4375 + -2.5t + t2 = 0 + -0.4375

Combine like terms: 0.4375 + -0.4375 = 0.0000
0.0000 + -2.5t + t2 = 0 + -0.4375
-2.5t + t2 = 0 + -0.4375

Combine like terms: 0 + -0.4375 = -0.4375
-2.5t + t2 = -0.4375

The t term is -2.5t.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5t + 1.5625 + t2 = -0.4375 + 1.5625

Reorder the terms:
1.5625 + -2.5t + t2 = -0.4375 + 1.5625

Combine like terms: -0.4375 + 1.5625 = 1.125
1.5625 + -2.5t + t2 = 1.125

Factor a perfect square on the left side:
(t + -1.25)(t + -1.25) = 1.125

Calculate the square root of the right side: 1.060660172

Break this problem into two subproblems by setting 
(t + -1.25) equal to 1.060660172 and -1.060660172.

Subproblem 1

t + -1.25 = 1.060660172 Simplifying t + -1.25 = 1.060660172 Reorder the terms: -1.25 + t = 1.060660172 Solving -1.25 + t = 1.060660172 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + t = 1.060660172 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + t = 1.060660172 + 1.25 t = 1.060660172 + 1.25 Combine like terms: 1.060660172 + 1.25 = 2.310660172 t = 2.310660172 Simplifying t = 2.310660172

Subproblem 2

t + -1.25 = -1.060660172 Simplifying t + -1.25 = -1.060660172 Reorder the terms: -1.25 + t = -1.060660172 Solving -1.25 + t = -1.060660172 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + t = -1.060660172 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + t = -1.060660172 + 1.25 t = -1.060660172 + 1.25 Combine like terms: -1.060660172 + 1.25 = 0.189339828 t = 0.189339828 Simplifying t = 0.189339828

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.310660172, 0.189339828}

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