.5(9.8)t^2+15t-45=0

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Solution for .5(9.8)t^2+15t-45=0 equation:


Simplifying
0.5(9.8) * t2 + 15t + -45 = 0

Multiply 0.5 * 9.8
4.9t2 + 15t + -45 = 0

Reorder the terms:
-45 + 15t + 4.9t2 = 0

Solving
-45 + 15t + 4.9t2 = 0

Solving for variable 't'.

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

Divide each side by '4.9'.
-9.183673469 + 3.06122449t + t2 = 0

Move the constant term to the right:

Add '9.183673469' to each side of the equation.
-9.183673469 + 3.06122449t + 9.183673469 + t2 = 0 + 9.183673469

Reorder the terms:
-9.183673469 + 9.183673469 + 3.06122449t + t2 = 0 + 9.183673469

Combine like terms: -9.183673469 + 9.183673469 = 0.000000000
0.000000000 + 3.06122449t + t2 = 0 + 9.183673469
3.06122449t + t2 = 0 + 9.183673469

Combine like terms: 0 + 9.183673469 = 9.183673469
3.06122449t + t2 = 9.183673469

The t term is 3.06122449t.  Take half its coefficient (1.530612245).
Square it (2.342773845) and add it to both sides.

Add '2.342773845' to each side of the equation.
3.06122449t + 2.342773845 + t2 = 9.183673469 + 2.342773845

Reorder the terms:
2.342773845 + 3.06122449t + t2 = 9.183673469 + 2.342773845

Combine like terms: 9.183673469 + 2.342773845 = 11.526447314
2.342773845 + 3.06122449t + t2 = 11.526447314

Factor a perfect square on the left side:
(t + 1.530612245)(t + 1.530612245) = 11.526447314

Calculate the square root of the right side: 3.395062196

Break this problem into two subproblems by setting 
(t + 1.530612245) equal to 3.395062196 and -3.395062196.

Subproblem 1

t + 1.530612245 = 3.395062196 Simplifying t + 1.530612245 = 3.395062196 Reorder the terms: 1.530612245 + t = 3.395062196 Solving 1.530612245 + t = 3.395062196 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-1.530612245' to each side of the equation. 1.530612245 + -1.530612245 + t = 3.395062196 + -1.530612245 Combine like terms: 1.530612245 + -1.530612245 = 0.000000000 0.000000000 + t = 3.395062196 + -1.530612245 t = 3.395062196 + -1.530612245 Combine like terms: 3.395062196 + -1.530612245 = 1.864449951 t = 1.864449951 Simplifying t = 1.864449951

Subproblem 2

t + 1.530612245 = -3.395062196 Simplifying t + 1.530612245 = -3.395062196 Reorder the terms: 1.530612245 + t = -3.395062196 Solving 1.530612245 + t = -3.395062196 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-1.530612245' to each side of the equation. 1.530612245 + -1.530612245 + t = -3.395062196 + -1.530612245 Combine like terms: 1.530612245 + -1.530612245 = 0.000000000 0.000000000 + t = -3.395062196 + -1.530612245 t = -3.395062196 + -1.530612245 Combine like terms: -3.395062196 + -1.530612245 = -4.925674441 t = -4.925674441 Simplifying t = -4.925674441

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.864449951, -4.925674441}

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