-9t^2-2t+8=0

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Solution for -9t^2-2t+8=0 equation:


Simplifying
-9t2 + -2t + 8 = 0

Reorder the terms:
8 + -2t + -9t2 = 0

Solving
8 + -2t + -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'.
-0.8888888889 + 0.2222222222t + t2 = 0

Move the constant term to the right:

Add '0.8888888889' to each side of the equation.
-0.8888888889 + 0.2222222222t + 0.8888888889 + t2 = 0 + 0.8888888889

Reorder the terms:
-0.8888888889 + 0.8888888889 + 0.2222222222t + t2 = 0 + 0.8888888889

Combine like terms: -0.8888888889 + 0.8888888889 = 0.0000000000
0.0000000000 + 0.2222222222t + t2 = 0 + 0.8888888889
0.2222222222t + t2 = 0 + 0.8888888889

Combine like terms: 0 + 0.8888888889 = 0.8888888889
0.2222222222t + t2 = 0.8888888889

The t term is 0.2222222222t.  Take half its coefficient (0.1111111111).
Square it (0.01234567901) and add it to both sides.

Add '0.01234567901' to each side of the equation.
0.2222222222t + 0.01234567901 + t2 = 0.8888888889 + 0.01234567901

Reorder the terms:
0.01234567901 + 0.2222222222t + t2 = 0.8888888889 + 0.01234567901

Combine like terms: 0.8888888889 + 0.01234567901 = 0.90123456791
0.01234567901 + 0.2222222222t + t2 = 0.90123456791

Factor a perfect square on the left side:
(t + 0.1111111111)(t + 0.1111111111) = 0.90123456791

Calculate the square root of the right side: 0.949333749

Break this problem into two subproblems by setting 
(t + 0.1111111111) equal to 0.949333749 and -0.949333749.

Subproblem 1

t + 0.1111111111 = 0.949333749 Simplifying t + 0.1111111111 = 0.949333749 Reorder the terms: 0.1111111111 + t = 0.949333749 Solving 0.1111111111 + t = 0.949333749 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.1111111111' to each side of the equation. 0.1111111111 + -0.1111111111 + t = 0.949333749 + -0.1111111111 Combine like terms: 0.1111111111 + -0.1111111111 = 0.0000000000 0.0000000000 + t = 0.949333749 + -0.1111111111 t = 0.949333749 + -0.1111111111 Combine like terms: 0.949333749 + -0.1111111111 = 0.8382226379 t = 0.8382226379 Simplifying t = 0.8382226379

Subproblem 2

t + 0.1111111111 = -0.949333749 Simplifying t + 0.1111111111 = -0.949333749 Reorder the terms: 0.1111111111 + t = -0.949333749 Solving 0.1111111111 + t = -0.949333749 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.1111111111' to each side of the equation. 0.1111111111 + -0.1111111111 + t = -0.949333749 + -0.1111111111 Combine like terms: 0.1111111111 + -0.1111111111 = 0.0000000000 0.0000000000 + t = -0.949333749 + -0.1111111111 t = -0.949333749 + -0.1111111111 Combine like terms: -0.949333749 + -0.1111111111 = -1.0604448601 t = -1.0604448601 Simplifying t = -1.0604448601

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.8382226379, -1.0604448601}

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