0=-3t^2+30t-23

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Solution for 0=-3t^2+30t-23 equation:


Simplifying
0 = -3t2 + 30t + -23

Reorder the terms:
0 = -23 + 30t + -3t2

Solving
0 = -23 + 30t + -3t2

Solving for variable 't'.

Combine like terms: 0 + 23 = 23
23 + -30t + 3t2 = -23 + 30t + -3t2 + 23 + -30t + 3t2

Reorder the terms:
23 + -30t + 3t2 = -23 + 23 + 30t + -30t + -3t2 + 3t2

Combine like terms: -23 + 23 = 0
23 + -30t + 3t2 = 0 + 30t + -30t + -3t2 + 3t2
23 + -30t + 3t2 = 30t + -30t + -3t2 + 3t2

Combine like terms: 30t + -30t = 0
23 + -30t + 3t2 = 0 + -3t2 + 3t2
23 + -30t + 3t2 = -3t2 + 3t2

Combine like terms: -3t2 + 3t2 = 0
23 + -30t + 3t2 = 0

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

Divide each side by '3'.
7.666666667 + -10t + t2 = 0

Move the constant term to the right:

Add '-7.666666667' to each side of the equation.
7.666666667 + -10t + -7.666666667 + t2 = 0 + -7.666666667

Reorder the terms:
7.666666667 + -7.666666667 + -10t + t2 = 0 + -7.666666667

Combine like terms: 7.666666667 + -7.666666667 = 0.000000000
0.000000000 + -10t + t2 = 0 + -7.666666667
-10t + t2 = 0 + -7.666666667

Combine like terms: 0 + -7.666666667 = -7.666666667
-10t + t2 = -7.666666667

The t term is -10t.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10t + 25 + t2 = -7.666666667 + 25

Reorder the terms:
25 + -10t + t2 = -7.666666667 + 25

Combine like terms: -7.666666667 + 25 = 17.333333333
25 + -10t + t2 = 17.333333333

Factor a perfect square on the left side:
(t + -5)(t + -5) = 17.333333333

Calculate the square root of the right side: 4.163331999

Break this problem into two subproblems by setting 
(t + -5) equal to 4.163331999 and -4.163331999.

Subproblem 1

t + -5 = 4.163331999 Simplifying t + -5 = 4.163331999 Reorder the terms: -5 + t = 4.163331999 Solving -5 + t = 4.163331999 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + t = 4.163331999 + 5 Combine like terms: -5 + 5 = 0 0 + t = 4.163331999 + 5 t = 4.163331999 + 5 Combine like terms: 4.163331999 + 5 = 9.163331999 t = 9.163331999 Simplifying t = 9.163331999

Subproblem 2

t + -5 = -4.163331999 Simplifying t + -5 = -4.163331999 Reorder the terms: -5 + t = -4.163331999 Solving -5 + t = -4.163331999 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + t = -4.163331999 + 5 Combine like terms: -5 + 5 = 0 0 + t = -4.163331999 + 5 t = -4.163331999 + 5 Combine like terms: -4.163331999 + 5 = 0.836668001 t = 0.836668001 Simplifying t = 0.836668001

Solution

The solution to the problem is based on the solutions from the subproblems. t = {9.163331999, 0.836668001}

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