-15t^2-90t+17=0

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Solution for -15t^2-90t+17=0 equation:


Simplifying
-15t2 + -90t + 17 = 0

Reorder the terms:
17 + -90t + -15t2 = 0

Solving
17 + -90t + -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'.
-1.133333333 + 6t + t2 = 0

Move the constant term to the right:

Add '1.133333333' to each side of the equation.
-1.133333333 + 6t + 1.133333333 + t2 = 0 + 1.133333333

Reorder the terms:
-1.133333333 + 1.133333333 + 6t + t2 = 0 + 1.133333333

Combine like terms: -1.133333333 + 1.133333333 = 0.000000000
0.000000000 + 6t + t2 = 0 + 1.133333333
6t + t2 = 0 + 1.133333333

Combine like terms: 0 + 1.133333333 = 1.133333333
6t + t2 = 1.133333333

The t term is 6t.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6t + 9 + t2 = 1.133333333 + 9

Reorder the terms:
9 + 6t + t2 = 1.133333333 + 9

Combine like terms: 1.133333333 + 9 = 10.133333333
9 + 6t + t2 = 10.133333333

Factor a perfect square on the left side:
(t + 3)(t + 3) = 10.133333333

Calculate the square root of the right side: 3.183289703

Break this problem into two subproblems by setting 
(t + 3) equal to 3.183289703 and -3.183289703.

Subproblem 1

t + 3 = 3.183289703 Simplifying t + 3 = 3.183289703 Reorder the terms: 3 + t = 3.183289703 Solving 3 + t = 3.183289703 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + t = 3.183289703 + -3 Combine like terms: 3 + -3 = 0 0 + t = 3.183289703 + -3 t = 3.183289703 + -3 Combine like terms: 3.183289703 + -3 = 0.183289703 t = 0.183289703 Simplifying t = 0.183289703

Subproblem 2

t + 3 = -3.183289703 Simplifying t + 3 = -3.183289703 Reorder the terms: 3 + t = -3.183289703 Solving 3 + t = -3.183289703 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + t = -3.183289703 + -3 Combine like terms: 3 + -3 = 0 0 + t = -3.183289703 + -3 t = -3.183289703 + -3 Combine like terms: -3.183289703 + -3 = -6.183289703 t = -6.183289703 Simplifying t = -6.183289703

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.183289703, -6.183289703}

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