-t^2+31t-145=0

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Solution for -t^2+31t-145=0 equation:


Simplifying
-1t2 + 31t + -145 = 0

Reorder the terms:
-145 + 31t + -1t2 = 0

Solving
-145 + 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'.
145 + -31t + t2 = 0

Move the constant term to the right:

Add '-145' to each side of the equation.
145 + -31t + -145 + t2 = 0 + -145

Reorder the terms:
145 + -145 + -31t + t2 = 0 + -145

Combine like terms: 145 + -145 = 0
0 + -31t + t2 = 0 + -145
-31t + t2 = 0 + -145

Combine like terms: 0 + -145 = -145
-31t + t2 = -145

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 = -145 + 240.25

Reorder the terms:
240.25 + -31t + t2 = -145 + 240.25

Combine like terms: -145 + 240.25 = 95.25
240.25 + -31t + t2 = 95.25

Factor a perfect square on the left side:
(t + -15.5)(t + -15.5) = 95.25

Calculate the square root of the right side: 9.759610648

Break this problem into two subproblems by setting 
(t + -15.5) equal to 9.759610648 and -9.759610648.

Subproblem 1

t + -15.5 = 9.759610648 Simplifying t + -15.5 = 9.759610648 Reorder the terms: -15.5 + t = 9.759610648 Solving -15.5 + t = 9.759610648 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 = 9.759610648 + 15.5 Combine like terms: -15.5 + 15.5 = 0.0 0.0 + t = 9.759610648 + 15.5 t = 9.759610648 + 15.5 Combine like terms: 9.759610648 + 15.5 = 25.259610648 t = 25.259610648 Simplifying t = 25.259610648

Subproblem 2

t + -15.5 = -9.759610648 Simplifying t + -15.5 = -9.759610648 Reorder the terms: -15.5 + t = -9.759610648 Solving -15.5 + t = -9.759610648 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 = -9.759610648 + 15.5 Combine like terms: -15.5 + 15.5 = 0.0 0.0 + t = -9.759610648 + 15.5 t = -9.759610648 + 15.5 Combine like terms: -9.759610648 + 15.5 = 5.740389352 t = 5.740389352 Simplifying t = 5.740389352

Solution

The solution to the problem is based on the solutions from the subproblems. t = {25.259610648, 5.740389352}

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