13-8t-t^2=0

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Solution for 13-8t-t^2=0 equation:


Simplifying
13 + -8t + -1t2 = 0

Solving
13 + -8t + -1t2 = 0

Solving for variable 't'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-13 + 8t + t2 = 0

Move the constant term to the right:

Add '13' to each side of the equation.
-13 + 8t + 13 + t2 = 0 + 13

Reorder the terms:
-13 + 13 + 8t + t2 = 0 + 13

Combine like terms: -13 + 13 = 0
0 + 8t + t2 = 0 + 13
8t + t2 = 0 + 13

Combine like terms: 0 + 13 = 13
8t + t2 = 13

The t term is 8t.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8t + 16 + t2 = 13 + 16

Reorder the terms:
16 + 8t + t2 = 13 + 16

Combine like terms: 13 + 16 = 29
16 + 8t + t2 = 29

Factor a perfect square on the left side:
(t + 4)(t + 4) = 29

Calculate the square root of the right side: 5.385164807

Break this problem into two subproblems by setting 
(t + 4) equal to 5.385164807 and -5.385164807.

Subproblem 1

t + 4 = 5.385164807 Simplifying t + 4 = 5.385164807 Reorder the terms: 4 + t = 5.385164807 Solving 4 + t = 5.385164807 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + t = 5.385164807 + -4 Combine like terms: 4 + -4 = 0 0 + t = 5.385164807 + -4 t = 5.385164807 + -4 Combine like terms: 5.385164807 + -4 = 1.385164807 t = 1.385164807 Simplifying t = 1.385164807

Subproblem 2

t + 4 = -5.385164807 Simplifying t + 4 = -5.385164807 Reorder the terms: 4 + t = -5.385164807 Solving 4 + t = -5.385164807 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + t = -5.385164807 + -4 Combine like terms: 4 + -4 = 0 0 + t = -5.385164807 + -4 t = -5.385164807 + -4 Combine like terms: -5.385164807 + -4 = -9.385164807 t = -9.385164807 Simplifying t = -9.385164807

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.385164807, -9.385164807}

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