-.921=-1.09*t+.5*-9.8t^2

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Solution for -.921=-1.09*t+.5*-9.8t^2 equation:


Simplifying
-0.921 = -1.09t + 0.5 * -9.8t2

Multiply 0.5 * -9.8
-0.921 = -1.09t + -4.9t2

Solving
-0.921 = -1.09t + -4.9t2

Solving for variable 't'.

Reorder the terms:
-0.921 + 1.09t + 4.9t2 = -1.09t + 1.09t + -4.9t2 + 4.9t2

Combine like terms: -1.09t + 1.09t = 0.00
-0.921 + 1.09t + 4.9t2 = 0.00 + -4.9t2 + 4.9t2
-0.921 + 1.09t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
-0.921 + 1.09t + 4.9t2 = 0.0

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

Divide each side by '4.9'.
-0.1879591837 + 0.2224489796t + t2 = 0

Move the constant term to the right:

Add '0.1879591837' to each side of the equation.
-0.1879591837 + 0.2224489796t + 0.1879591837 + t2 = 0 + 0.1879591837

Reorder the terms:
-0.1879591837 + 0.1879591837 + 0.2224489796t + t2 = 0 + 0.1879591837

Combine like terms: -0.1879591837 + 0.1879591837 = 0.0000000000
0.0000000000 + 0.2224489796t + t2 = 0 + 0.1879591837
0.2224489796t + t2 = 0 + 0.1879591837

Combine like terms: 0 + 0.1879591837 = 0.1879591837
0.2224489796t + t2 = 0.1879591837

The t term is 0.2224489796t.  Take half its coefficient (0.1112244898).
Square it (0.01237088713) and add it to both sides.

Add '0.01237088713' to each side of the equation.
0.2224489796t + 0.01237088713 + t2 = 0.1879591837 + 0.01237088713

Reorder the terms:
0.01237088713 + 0.2224489796t + t2 = 0.1879591837 + 0.01237088713

Combine like terms: 0.1879591837 + 0.01237088713 = 0.20033007083
0.01237088713 + 0.2224489796t + t2 = 0.20033007083

Factor a perfect square on the left side:
(t + 0.1112244898)(t + 0.1112244898) = 0.20033007083

Calculate the square root of the right side: 0.447582474

Break this problem into two subproblems by setting 
(t + 0.1112244898) equal to 0.447582474 and -0.447582474.

Subproblem 1

t + 0.1112244898 = 0.447582474 Simplifying t + 0.1112244898 = 0.447582474 Reorder the terms: 0.1112244898 + t = 0.447582474 Solving 0.1112244898 + t = 0.447582474 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.1112244898' to each side of the equation. 0.1112244898 + -0.1112244898 + t = 0.447582474 + -0.1112244898 Combine like terms: 0.1112244898 + -0.1112244898 = 0.0000000000 0.0000000000 + t = 0.447582474 + -0.1112244898 t = 0.447582474 + -0.1112244898 Combine like terms: 0.447582474 + -0.1112244898 = 0.3363579842 t = 0.3363579842 Simplifying t = 0.3363579842

Subproblem 2

t + 0.1112244898 = -0.447582474 Simplifying t + 0.1112244898 = -0.447582474 Reorder the terms: 0.1112244898 + t = -0.447582474 Solving 0.1112244898 + t = -0.447582474 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.1112244898' to each side of the equation. 0.1112244898 + -0.1112244898 + t = -0.447582474 + -0.1112244898 Combine like terms: 0.1112244898 + -0.1112244898 = 0.0000000000 0.0000000000 + t = -0.447582474 + -0.1112244898 t = -0.447582474 + -0.1112244898 Combine like terms: -0.447582474 + -0.1112244898 = -0.5588069638 t = -0.5588069638 Simplifying t = -0.5588069638

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.3363579842, -0.5588069638}

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