8=15t-4.9t^2

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Solution for 8=15t-4.9t^2 equation:


Simplifying
8 = 15t + -4.9t2

Solving
8 = 15t + -4.9t2

Solving for variable 't'.

Reorder the terms:
8 + -15t + 4.9t2 = 15t + -15t + -4.9t2 + 4.9t2

Combine like terms: 15t + -15t = 0
8 + -15t + 4.9t2 = 0 + -4.9t2 + 4.9t2
8 + -15t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
8 + -15t + 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'.
1.632653061 + -3.06122449t + t2 = 0

Move the constant term to the right:

Add '-1.632653061' to each side of the equation.
1.632653061 + -3.06122449t + -1.632653061 + t2 = 0 + -1.632653061

Reorder the terms:
1.632653061 + -1.632653061 + -3.06122449t + t2 = 0 + -1.632653061

Combine like terms: 1.632653061 + -1.632653061 = 0.000000000
0.000000000 + -3.06122449t + t2 = 0 + -1.632653061
-3.06122449t + t2 = 0 + -1.632653061

Combine like terms: 0 + -1.632653061 = -1.632653061
-3.06122449t + t2 = -1.632653061

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 = -1.632653061 + 2.342773845

Reorder the terms:
2.342773845 + -3.06122449t + t2 = -1.632653061 + 2.342773845

Combine like terms: -1.632653061 + 2.342773845 = 0.710120784
2.342773845 + -3.06122449t + t2 = 0.710120784

Factor a perfect square on the left side:
(t + -1.530612245)(t + -1.530612245) = 0.710120784

Calculate the square root of the right side: 0.842686646

Break this problem into two subproblems by setting 
(t + -1.530612245) equal to 0.842686646 and -0.842686646.

Subproblem 1

t + -1.530612245 = 0.842686646 Simplifying t + -1.530612245 = 0.842686646 Reorder the terms: -1.530612245 + t = 0.842686646 Solving -1.530612245 + t = 0.842686646 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 = 0.842686646 + 1.530612245 Combine like terms: -1.530612245 + 1.530612245 = 0.000000000 0.000000000 + t = 0.842686646 + 1.530612245 t = 0.842686646 + 1.530612245 Combine like terms: 0.842686646 + 1.530612245 = 2.373298891 t = 2.373298891 Simplifying t = 2.373298891

Subproblem 2

t + -1.530612245 = -0.842686646 Simplifying t + -1.530612245 = -0.842686646 Reorder the terms: -1.530612245 + t = -0.842686646 Solving -1.530612245 + t = -0.842686646 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 = -0.842686646 + 1.530612245 Combine like terms: -1.530612245 + 1.530612245 = 0.000000000 0.000000000 + t = -0.842686646 + 1.530612245 t = -0.842686646 + 1.530612245 Combine like terms: -0.842686646 + 1.530612245 = 0.687925599 t = 0.687925599 Simplifying t = 0.687925599

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.373298891, 0.687925599}

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