-t^2+9t+1=0

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Solution for -t^2+9t+1=0 equation:


Simplifying
-1t2 + 9t + 1 = 0

Reorder the terms:
1 + 9t + -1t2 = 0

Solving
1 + 9t + -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'.
-1 + -9t + t2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -9t + 1 + t2 = 0 + 1

Reorder the terms:
-1 + 1 + -9t + t2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -9t + t2 = 0 + 1
-9t + t2 = 0 + 1

Combine like terms: 0 + 1 = 1
-9t + t2 = 1

The t term is -9t.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9t + 20.25 + t2 = 1 + 20.25

Reorder the terms:
20.25 + -9t + t2 = 1 + 20.25

Combine like terms: 1 + 20.25 = 21.25
20.25 + -9t + t2 = 21.25

Factor a perfect square on the left side:
(t + -4.5)(t + -4.5) = 21.25

Calculate the square root of the right side: 4.609772229

Break this problem into two subproblems by setting 
(t + -4.5) equal to 4.609772229 and -4.609772229.

Subproblem 1

t + -4.5 = 4.609772229 Simplifying t + -4.5 = 4.609772229 Reorder the terms: -4.5 + t = 4.609772229 Solving -4.5 + t = 4.609772229 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + t = 4.609772229 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + t = 4.609772229 + 4.5 t = 4.609772229 + 4.5 Combine like terms: 4.609772229 + 4.5 = 9.109772229 t = 9.109772229 Simplifying t = 9.109772229

Subproblem 2

t + -4.5 = -4.609772229 Simplifying t + -4.5 = -4.609772229 Reorder the terms: -4.5 + t = -4.609772229 Solving -4.5 + t = -4.609772229 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + t = -4.609772229 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + t = -4.609772229 + 4.5 t = -4.609772229 + 4.5 Combine like terms: -4.609772229 + 4.5 = -0.109772229 t = -0.109772229 Simplifying t = -0.109772229

Solution

The solution to the problem is based on the solutions from the subproblems. t = {9.109772229, -0.109772229}

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