t^2-t-216=0

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Solution for t^2-t-216=0 equation:


Simplifying
t2 + -1t + -216 = 0

Reorder the terms:
-216 + -1t + t2 = 0

Solving
-216 + -1t + t2 = 0

Solving for variable 't'.

Begin completing the square.

Move the constant term to the right:

Add '216' to each side of the equation.
-216 + -1t + 216 + t2 = 0 + 216

Reorder the terms:
-216 + 216 + -1t + t2 = 0 + 216

Combine like terms: -216 + 216 = 0
0 + -1t + t2 = 0 + 216
-1t + t2 = 0 + 216

Combine like terms: 0 + 216 = 216
-1t + t2 = 216

The t term is -1t.  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.
-1t + 0.25 + t2 = 216 + 0.25

Reorder the terms:
0.25 + -1t + t2 = 216 + 0.25

Combine like terms: 216 + 0.25 = 216.25
0.25 + -1t + t2 = 216.25

Factor a perfect square on the left side:
(t + -0.5)(t + -0.5) = 216.25

Calculate the square root of the right side: 14.70544117

Break this problem into two subproblems by setting 
(t + -0.5) equal to 14.70544117 and -14.70544117.

Subproblem 1

t + -0.5 = 14.70544117 Simplifying t + -0.5 = 14.70544117 Reorder the terms: -0.5 + t = 14.70544117 Solving -0.5 + t = 14.70544117 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 = 14.70544117 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + t = 14.70544117 + 0.5 t = 14.70544117 + 0.5 Combine like terms: 14.70544117 + 0.5 = 15.20544117 t = 15.20544117 Simplifying t = 15.20544117

Subproblem 2

t + -0.5 = -14.70544117 Simplifying t + -0.5 = -14.70544117 Reorder the terms: -0.5 + t = -14.70544117 Solving -0.5 + t = -14.70544117 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 = -14.70544117 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + t = -14.70544117 + 0.5 t = -14.70544117 + 0.5 Combine like terms: -14.70544117 + 0.5 = -14.20544117 t = -14.20544117 Simplifying t = -14.20544117

Solution

The solution to the problem is based on the solutions from the subproblems. t = {15.20544117, -14.20544117}

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