0=-16t^2+131t+84

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Solution for 0=-16t^2+131t+84 equation:


Simplifying
0 = -16t2 + 131t + 84

Reorder the terms:
0 = 84 + 131t + -16t2

Solving
0 = 84 + 131t + -16t2

Solving for variable 't'.

Combine like terms: 0 + -84 = -84
-84 + -131t + 16t2 = 84 + 131t + -16t2 + -84 + -131t + 16t2

Reorder the terms:
-84 + -131t + 16t2 = 84 + -84 + 131t + -131t + -16t2 + 16t2

Combine like terms: 84 + -84 = 0
-84 + -131t + 16t2 = 0 + 131t + -131t + -16t2 + 16t2
-84 + -131t + 16t2 = 131t + -131t + -16t2 + 16t2

Combine like terms: 131t + -131t = 0
-84 + -131t + 16t2 = 0 + -16t2 + 16t2
-84 + -131t + 16t2 = -16t2 + 16t2

Combine like terms: -16t2 + 16t2 = 0
-84 + -131t + 16t2 = 0

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

Divide each side by '16'.
-5.25 + -8.1875t + t2 = 0

Move the constant term to the right:

Add '5.25' to each side of the equation.
-5.25 + -8.1875t + 5.25 + t2 = 0 + 5.25

Reorder the terms:
-5.25 + 5.25 + -8.1875t + t2 = 0 + 5.25

Combine like terms: -5.25 + 5.25 = 0.00
0.00 + -8.1875t + t2 = 0 + 5.25
-8.1875t + t2 = 0 + 5.25

Combine like terms: 0 + 5.25 = 5.25
-8.1875t + t2 = 5.25

The t term is -8.1875t.  Take half its coefficient (-4.09375).
Square it (16.75878906) and add it to both sides.

Add '16.75878906' to each side of the equation.
-8.1875t + 16.75878906 + t2 = 5.25 + 16.75878906

Reorder the terms:
16.75878906 + -8.1875t + t2 = 5.25 + 16.75878906

Combine like terms: 5.25 + 16.75878906 = 22.00878906
16.75878906 + -8.1875t + t2 = 22.00878906

Factor a perfect square on the left side:
(t + -4.09375)(t + -4.09375) = 22.00878906

Calculate the square root of the right side: 4.691352583

Break this problem into two subproblems by setting 
(t + -4.09375) equal to 4.691352583 and -4.691352583.

Subproblem 1

t + -4.09375 = 4.691352583 Simplifying t + -4.09375 = 4.691352583 Reorder the terms: -4.09375 + t = 4.691352583 Solving -4.09375 + t = 4.691352583 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4.09375' to each side of the equation. -4.09375 + 4.09375 + t = 4.691352583 + 4.09375 Combine like terms: -4.09375 + 4.09375 = 0.00000 0.00000 + t = 4.691352583 + 4.09375 t = 4.691352583 + 4.09375 Combine like terms: 4.691352583 + 4.09375 = 8.785102583 t = 8.785102583 Simplifying t = 8.785102583

Subproblem 2

t + -4.09375 = -4.691352583 Simplifying t + -4.09375 = -4.691352583 Reorder the terms: -4.09375 + t = -4.691352583 Solving -4.09375 + t = -4.691352583 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4.09375' to each side of the equation. -4.09375 + 4.09375 + t = -4.691352583 + 4.09375 Combine like terms: -4.09375 + 4.09375 = 0.00000 0.00000 + t = -4.691352583 + 4.09375 t = -4.691352583 + 4.09375 Combine like terms: -4.691352583 + 4.09375 = -0.597602583 t = -0.597602583 Simplifying t = -0.597602583

Solution

The solution to the problem is based on the solutions from the subproblems. t = {8.785102583, -0.597602583}

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