8.688=(t^2)+t

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Solution for 8.688=(t^2)+t equation:


Simplifying
8.688 = (t2) + t
8.688 = t2 + t

Reorder the terms:
8.688 = t + t2

Solving
8.688 = t + t2

Solving for variable 't'.

Reorder the terms:
8.688 + -1t + -1t2 = t + -1t + t2 + -1t2

Combine like terms: t + -1t = 0
8.688 + -1t + -1t2 = 0 + t2 + -1t2
8.688 + -1t + -1t2 = t2 + -1t2

Combine like terms: t2 + -1t2 = 0
8.688 + -1t + -1t2 = 0

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

Divide each side by '-1'.
-8.688 + t + t2 = 0

Move the constant term to the right:

Add '8.688' to each side of the equation.
-8.688 + t + 8.688 + t2 = 0 + 8.688

Reorder the terms:
-8.688 + 8.688 + t + t2 = 0 + 8.688

Combine like terms: -8.688 + 8.688 = 0.000
0.000 + t + t2 = 0 + 8.688
t + t2 = 0 + 8.688

Combine like terms: 0 + 8.688 = 8.688
t + t2 = 8.688

The t term is t.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + t2 = 8.688 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + t2 = 8.688 + 0.25

Combine like terms: 8.688 + 0.25 = 8.938
1.25 + t2 = 8.938

Factor a perfect square on the left side:
(t + 0.5)(t + 0.5) = 8.938

Calculate the square root of the right side: 2.989648809

Break this problem into two subproblems by setting 
(t + 0.5) equal to 2.989648809 and -2.989648809.

Subproblem 1

t + 0.5 = 2.989648809 Simplifying t + 0.5 = 2.989648809 Reorder the terms: 0.5 + t = 2.989648809 Solving 0.5 + t = 2.989648809 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + t = 2.989648809 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + t = 2.989648809 + -0.5 t = 2.989648809 + -0.5 Combine like terms: 2.989648809 + -0.5 = 2.489648809 t = 2.489648809 Simplifying t = 2.489648809

Subproblem 2

t + 0.5 = -2.989648809 Simplifying t + 0.5 = -2.989648809 Reorder the terms: 0.5 + t = -2.989648809 Solving 0.5 + t = -2.989648809 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + t = -2.989648809 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + t = -2.989648809 + -0.5 t = -2.989648809 + -0.5 Combine like terms: -2.989648809 + -0.5 = -3.489648809 t = -3.489648809 Simplifying t = -3.489648809

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.489648809, -3.489648809}

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