13=5+23t+16t^2

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Solution for 13=5+23t+16t^2 equation:


Simplifying
13 = 5 + 23t + 16t2

Solving
13 = 5 + 23t + 16t2

Solving for variable 't'.

Combine like terms: 13 + -5 = 8
8 + -23t + -16t2 = 5 + 23t + 16t2 + -5 + -23t + -16t2

Reorder the terms:
8 + -23t + -16t2 = 5 + -5 + 23t + -23t + 16t2 + -16t2

Combine like terms: 5 + -5 = 0
8 + -23t + -16t2 = 0 + 23t + -23t + 16t2 + -16t2
8 + -23t + -16t2 = 23t + -23t + 16t2 + -16t2

Combine like terms: 23t + -23t = 0
8 + -23t + -16t2 = 0 + 16t2 + -16t2
8 + -23t + -16t2 = 16t2 + -16t2

Combine like terms: 16t2 + -16t2 = 0
8 + -23t + -16t2 = 0

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

Divide each side by '-16'.
-0.5 + 1.4375t + t2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + 1.4375t + 0.5 + t2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + 1.4375t + t2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + 1.4375t + t2 = 0 + 0.5
1.4375t + t2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
1.4375t + t2 = 0.5

The t term is 1.4375t.  Take half its coefficient (0.71875).
Square it (0.5166015625) and add it to both sides.

Add '0.5166015625' to each side of the equation.
1.4375t + 0.5166015625 + t2 = 0.5 + 0.5166015625

Reorder the terms:
0.5166015625 + 1.4375t + t2 = 0.5 + 0.5166015625

Combine like terms: 0.5 + 0.5166015625 = 1.0166015625
0.5166015625 + 1.4375t + t2 = 1.0166015625

Factor a perfect square on the left side:
(t + 0.71875)(t + 0.71875) = 1.0166015625

Calculate the square root of the right side: 1.008266613

Break this problem into two subproblems by setting 
(t + 0.71875) equal to 1.008266613 and -1.008266613.

Subproblem 1

t + 0.71875 = 1.008266613 Simplifying t + 0.71875 = 1.008266613 Reorder the terms: 0.71875 + t = 1.008266613 Solving 0.71875 + t = 1.008266613 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.71875' to each side of the equation. 0.71875 + -0.71875 + t = 1.008266613 + -0.71875 Combine like terms: 0.71875 + -0.71875 = 0.00000 0.00000 + t = 1.008266613 + -0.71875 t = 1.008266613 + -0.71875 Combine like terms: 1.008266613 + -0.71875 = 0.289516613 t = 0.289516613 Simplifying t = 0.289516613

Subproblem 2

t + 0.71875 = -1.008266613 Simplifying t + 0.71875 = -1.008266613 Reorder the terms: 0.71875 + t = -1.008266613 Solving 0.71875 + t = -1.008266613 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.71875' to each side of the equation. 0.71875 + -0.71875 + t = -1.008266613 + -0.71875 Combine like terms: 0.71875 + -0.71875 = 0.00000 0.00000 + t = -1.008266613 + -0.71875 t = -1.008266613 + -0.71875 Combine like terms: -1.008266613 + -0.71875 = -1.727016613 t = -1.727016613 Simplifying t = -1.727016613

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.289516613, -1.727016613}

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