9t^2-25t-25=0

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Solution for 9t^2-25t-25=0 equation:


Simplifying
9t2 + -25t + -25 = 0

Reorder the terms:
-25 + -25t + 9t2 = 0

Solving
-25 + -25t + 9t2 = 0

Solving for variable 't'.

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

Divide each side by '9'.
-2.777777778 + -2.777777778t + t2 = 0

Move the constant term to the right:

Add '2.777777778' to each side of the equation.
-2.777777778 + -2.777777778t + 2.777777778 + t2 = 0 + 2.777777778

Reorder the terms:
-2.777777778 + 2.777777778 + -2.777777778t + t2 = 0 + 2.777777778

Combine like terms: -2.777777778 + 2.777777778 = 0.000000000
0.000000000 + -2.777777778t + t2 = 0 + 2.777777778
-2.777777778t + t2 = 0 + 2.777777778

Combine like terms: 0 + 2.777777778 = 2.777777778
-2.777777778t + t2 = 2.777777778

The t term is -2.777777778t.  Take half its coefficient (-1.388888889).
Square it (1.929012346) and add it to both sides.

Add '1.929012346' to each side of the equation.
-2.777777778t + 1.929012346 + t2 = 2.777777778 + 1.929012346

Reorder the terms:
1.929012346 + -2.777777778t + t2 = 2.777777778 + 1.929012346

Combine like terms: 2.777777778 + 1.929012346 = 4.706790124
1.929012346 + -2.777777778t + t2 = 4.706790124

Factor a perfect square on the left side:
(t + -1.388888889)(t + -1.388888889) = 4.706790124

Calculate the square root of the right side: 2.169513799

Break this problem into two subproblems by setting 
(t + -1.388888889) equal to 2.169513799 and -2.169513799.

Subproblem 1

t + -1.388888889 = 2.169513799 Simplifying t + -1.388888889 = 2.169513799 Reorder the terms: -1.388888889 + t = 2.169513799 Solving -1.388888889 + t = 2.169513799 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.388888889' to each side of the equation. -1.388888889 + 1.388888889 + t = 2.169513799 + 1.388888889 Combine like terms: -1.388888889 + 1.388888889 = 0.000000000 0.000000000 + t = 2.169513799 + 1.388888889 t = 2.169513799 + 1.388888889 Combine like terms: 2.169513799 + 1.388888889 = 3.558402688 t = 3.558402688 Simplifying t = 3.558402688

Subproblem 2

t + -1.388888889 = -2.169513799 Simplifying t + -1.388888889 = -2.169513799 Reorder the terms: -1.388888889 + t = -2.169513799 Solving -1.388888889 + t = -2.169513799 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.388888889' to each side of the equation. -1.388888889 + 1.388888889 + t = -2.169513799 + 1.388888889 Combine like terms: -1.388888889 + 1.388888889 = 0.000000000 0.000000000 + t = -2.169513799 + 1.388888889 t = -2.169513799 + 1.388888889 Combine like terms: -2.169513799 + 1.388888889 = -0.78062491 t = -0.78062491 Simplifying t = -0.78062491

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.558402688, -0.78062491}

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