-3t^2+15t+13=0

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Solution for -3t^2+15t+13=0 equation:


Simplifying
-3t2 + 15t + 13 = 0

Reorder the terms:
13 + 15t + -3t2 = 0

Solving
13 + 15t + -3t2 = 0

Solving for variable 't'.

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

Divide each side by '-3'.
-4.333333333 + -5t + t2 = 0

Move the constant term to the right:

Add '4.333333333' to each side of the equation.
-4.333333333 + -5t + 4.333333333 + t2 = 0 + 4.333333333

Reorder the terms:
-4.333333333 + 4.333333333 + -5t + t2 = 0 + 4.333333333

Combine like terms: -4.333333333 + 4.333333333 = 0.000000000
0.000000000 + -5t + t2 = 0 + 4.333333333
-5t + t2 = 0 + 4.333333333

Combine like terms: 0 + 4.333333333 = 4.333333333
-5t + t2 = 4.333333333

The t term is -5t.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5t + 6.25 + t2 = 4.333333333 + 6.25

Reorder the terms:
6.25 + -5t + t2 = 4.333333333 + 6.25

Combine like terms: 4.333333333 + 6.25 = 10.583333333
6.25 + -5t + t2 = 10.583333333

Factor a perfect square on the left side:
(t + -2.5)(t + -2.5) = 10.583333333

Calculate the square root of the right side: 3.253203549

Break this problem into two subproblems by setting 
(t + -2.5) equal to 3.253203549 and -3.253203549.

Subproblem 1

t + -2.5 = 3.253203549 Simplifying t + -2.5 = 3.253203549 Reorder the terms: -2.5 + t = 3.253203549 Solving -2.5 + t = 3.253203549 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + t = 3.253203549 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + t = 3.253203549 + 2.5 t = 3.253203549 + 2.5 Combine like terms: 3.253203549 + 2.5 = 5.753203549 t = 5.753203549 Simplifying t = 5.753203549

Subproblem 2

t + -2.5 = -3.253203549 Simplifying t + -2.5 = -3.253203549 Reorder the terms: -2.5 + t = -3.253203549 Solving -2.5 + t = -3.253203549 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + t = -3.253203549 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + t = -3.253203549 + 2.5 t = -3.253203549 + 2.5 Combine like terms: -3.253203549 + 2.5 = -0.753203549 t = -0.753203549 Simplifying t = -0.753203549

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.753203549, -0.753203549}

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