15t^2-16t-30=0

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Solution for 15t^2-16t-30=0 equation:


Simplifying
15t2 + -16t + -30 = 0

Reorder the terms:
-30 + -16t + 15t2 = 0

Solving
-30 + -16t + 15t2 = 0

Solving for variable 't'.

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

Divide each side by '15'.
-2 + -1.066666667t + t2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -1.066666667t + 2 + t2 = 0 + 2

Reorder the terms:
-2 + 2 + -1.066666667t + t2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -1.066666667t + t2 = 0 + 2
-1.066666667t + t2 = 0 + 2

Combine like terms: 0 + 2 = 2
-1.066666667t + t2 = 2

The t term is -1.066666667t.  Take half its coefficient (-0.5333333335).
Square it (0.2844444446) and add it to both sides.

Add '0.2844444446' to each side of the equation.
-1.066666667t + 0.2844444446 + t2 = 2 + 0.2844444446

Reorder the terms:
0.2844444446 + -1.066666667t + t2 = 2 + 0.2844444446

Combine like terms: 2 + 0.2844444446 = 2.2844444446
0.2844444446 + -1.066666667t + t2 = 2.2844444446

Factor a perfect square on the left side:
(t + -0.5333333335)(t + -0.5333333335) = 2.2844444446

Calculate the square root of the right side: 1.511437873

Break this problem into two subproblems by setting 
(t + -0.5333333335) equal to 1.511437873 and -1.511437873.

Subproblem 1

t + -0.5333333335 = 1.511437873 Simplifying t + -0.5333333335 = 1.511437873 Reorder the terms: -0.5333333335 + t = 1.511437873 Solving -0.5333333335 + t = 1.511437873 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.5333333335' to each side of the equation. -0.5333333335 + 0.5333333335 + t = 1.511437873 + 0.5333333335 Combine like terms: -0.5333333335 + 0.5333333335 = 0.0000000000 0.0000000000 + t = 1.511437873 + 0.5333333335 t = 1.511437873 + 0.5333333335 Combine like terms: 1.511437873 + 0.5333333335 = 2.0447712065 t = 2.0447712065 Simplifying t = 2.0447712065

Subproblem 2

t + -0.5333333335 = -1.511437873 Simplifying t + -0.5333333335 = -1.511437873 Reorder the terms: -0.5333333335 + t = -1.511437873 Solving -0.5333333335 + t = -1.511437873 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.5333333335' to each side of the equation. -0.5333333335 + 0.5333333335 + t = -1.511437873 + 0.5333333335 Combine like terms: -0.5333333335 + 0.5333333335 = 0.0000000000 0.0000000000 + t = -1.511437873 + 0.5333333335 t = -1.511437873 + 0.5333333335 Combine like terms: -1.511437873 + 0.5333333335 = -0.9781045395 t = -0.9781045395 Simplifying t = -0.9781045395

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.0447712065, -0.9781045395}

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