-16t^2+8t+9=0

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Solution for -16t^2+8t+9=0 equation:


Simplifying
-16t2 + 8t + 9 = 0

Reorder the terms:
9 + 8t + -16t2 = 0

Solving
9 + 8t + -16t2 = 0

Solving for variable 't'.

Begin completing the square.  Divide all terms by
-16 the coefficient of the squared term: 

Divide each side by '-16'.
-0.5625 + -0.5t + t2 = 0

Move the constant term to the right:

Add '0.5625' to each side of the equation.
-0.5625 + -0.5t + 0.5625 + t2 = 0 + 0.5625

Reorder the terms:
-0.5625 + 0.5625 + -0.5t + t2 = 0 + 0.5625

Combine like terms: -0.5625 + 0.5625 = 0.0000
0.0000 + -0.5t + t2 = 0 + 0.5625
-0.5t + t2 = 0 + 0.5625

Combine like terms: 0 + 0.5625 = 0.5625
-0.5t + t2 = 0.5625

The t term is -0.5t.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5t + 0.0625 + t2 = 0.5625 + 0.0625

Reorder the terms:
0.0625 + -0.5t + t2 = 0.5625 + 0.0625

Combine like terms: 0.5625 + 0.0625 = 0.625
0.0625 + -0.5t + t2 = 0.625

Factor a perfect square on the left side:
(t + -0.25)(t + -0.25) = 0.625

Calculate the square root of the right side: 0.790569415

Break this problem into two subproblems by setting 
(t + -0.25) equal to 0.790569415 and -0.790569415.

Subproblem 1

t + -0.25 = 0.790569415 Simplifying t + -0.25 = 0.790569415 Reorder the terms: -0.25 + t = 0.790569415 Solving -0.25 + t = 0.790569415 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + t = 0.790569415 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + t = 0.790569415 + 0.25 t = 0.790569415 + 0.25 Combine like terms: 0.790569415 + 0.25 = 1.040569415 t = 1.040569415 Simplifying t = 1.040569415

Subproblem 2

t + -0.25 = -0.790569415 Simplifying t + -0.25 = -0.790569415 Reorder the terms: -0.25 + t = -0.790569415 Solving -0.25 + t = -0.790569415 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + t = -0.790569415 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + t = -0.790569415 + 0.25 t = -0.790569415 + 0.25 Combine like terms: -0.790569415 + 0.25 = -0.540569415 t = -0.540569415 Simplifying t = -0.540569415

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.040569415, -0.540569415}

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