15t^2+9t-2=0

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Solution for 15t^2+9t-2=0 equation:


Simplifying
15t2 + 9t + -2 = 0

Reorder the terms:
-2 + 9t + 15t2 = 0

Solving
-2 + 9t + 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'.
-0.1333333333 + 0.6t + t2 = 0

Move the constant term to the right:

Add '0.1333333333' to each side of the equation.
-0.1333333333 + 0.6t + 0.1333333333 + t2 = 0 + 0.1333333333

Reorder the terms:
-0.1333333333 + 0.1333333333 + 0.6t + t2 = 0 + 0.1333333333

Combine like terms: -0.1333333333 + 0.1333333333 = 0.0000000000
0.0000000000 + 0.6t + t2 = 0 + 0.1333333333
0.6t + t2 = 0 + 0.1333333333

Combine like terms: 0 + 0.1333333333 = 0.1333333333
0.6t + t2 = 0.1333333333

The t term is 0.6t.  Take half its coefficient (0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
0.6t + 0.09 + t2 = 0.1333333333 + 0.09

Reorder the terms:
0.09 + 0.6t + t2 = 0.1333333333 + 0.09

Combine like terms: 0.1333333333 + 0.09 = 0.2233333333
0.09 + 0.6t + t2 = 0.2233333333

Factor a perfect square on the left side:
(t + 0.3)(t + 0.3) = 0.2233333333

Calculate the square root of the right side: 0.472581563

Break this problem into two subproblems by setting 
(t + 0.3) equal to 0.472581563 and -0.472581563.

Subproblem 1

t + 0.3 = 0.472581563 Simplifying t + 0.3 = 0.472581563 Reorder the terms: 0.3 + t = 0.472581563 Solving 0.3 + t = 0.472581563 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + t = 0.472581563 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + t = 0.472581563 + -0.3 t = 0.472581563 + -0.3 Combine like terms: 0.472581563 + -0.3 = 0.172581563 t = 0.172581563 Simplifying t = 0.172581563

Subproblem 2

t + 0.3 = -0.472581563 Simplifying t + 0.3 = -0.472581563 Reorder the terms: 0.3 + t = -0.472581563 Solving 0.3 + t = -0.472581563 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + t = -0.472581563 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + t = -0.472581563 + -0.3 t = -0.472581563 + -0.3 Combine like terms: -0.472581563 + -0.3 = -0.772581563 t = -0.772581563 Simplifying t = -0.772581563

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.172581563, -0.772581563}

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