-t^2+31t+125=0

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Solution for -t^2+31t+125=0 equation:


Simplifying
-1t2 + 31t + 125 = 0

Reorder the terms:
125 + 31t + -1t2 = 0

Solving
125 + 31t + -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'.
-125 + -31t + t2 = 0

Move the constant term to the right:

Add '125' to each side of the equation.
-125 + -31t + 125 + t2 = 0 + 125

Reorder the terms:
-125 + 125 + -31t + t2 = 0 + 125

Combine like terms: -125 + 125 = 0
0 + -31t + t2 = 0 + 125
-31t + t2 = 0 + 125

Combine like terms: 0 + 125 = 125
-31t + t2 = 125

The t term is -31t.  Take half its coefficient (-15.5).
Square it (240.25) and add it to both sides.

Add '240.25' to each side of the equation.
-31t + 240.25 + t2 = 125 + 240.25

Reorder the terms:
240.25 + -31t + t2 = 125 + 240.25

Combine like terms: 125 + 240.25 = 365.25
240.25 + -31t + t2 = 365.25

Factor a perfect square on the left side:
(t + -15.5)(t + -15.5) = 365.25

Calculate the square root of the right side: 19.111514854

Break this problem into two subproblems by setting 
(t + -15.5) equal to 19.111514854 and -19.111514854.

Subproblem 1

t + -15.5 = 19.111514854 Simplifying t + -15.5 = 19.111514854 Reorder the terms: -15.5 + t = 19.111514854 Solving -15.5 + t = 19.111514854 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '15.5' to each side of the equation. -15.5 + 15.5 + t = 19.111514854 + 15.5 Combine like terms: -15.5 + 15.5 = 0.0 0.0 + t = 19.111514854 + 15.5 t = 19.111514854 + 15.5 Combine like terms: 19.111514854 + 15.5 = 34.611514854 t = 34.611514854 Simplifying t = 34.611514854

Subproblem 2

t + -15.5 = -19.111514854 Simplifying t + -15.5 = -19.111514854 Reorder the terms: -15.5 + t = -19.111514854 Solving -15.5 + t = -19.111514854 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '15.5' to each side of the equation. -15.5 + 15.5 + t = -19.111514854 + 15.5 Combine like terms: -15.5 + 15.5 = 0.0 0.0 + t = -19.111514854 + 15.5 t = -19.111514854 + 15.5 Combine like terms: -19.111514854 + 15.5 = -3.611514854 t = -3.611514854 Simplifying t = -3.611514854

Solution

The solution to the problem is based on the solutions from the subproblems. t = {34.611514854, -3.611514854}

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