0=49-2t-5t^2

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Solution for 0=49-2t-5t^2 equation:


Simplifying
0 = 49 + -2t + -5t2

Solving
0 = 49 + -2t + -5t2

Solving for variable 't'.

Combine like terms: 0 + -49 = -49
-49 + 2t + 5t2 = 49 + -2t + -5t2 + -49 + 2t + 5t2

Reorder the terms:
-49 + 2t + 5t2 = 49 + -49 + -2t + 2t + -5t2 + 5t2

Combine like terms: 49 + -49 = 0
-49 + 2t + 5t2 = 0 + -2t + 2t + -5t2 + 5t2
-49 + 2t + 5t2 = -2t + 2t + -5t2 + 5t2

Combine like terms: -2t + 2t = 0
-49 + 2t + 5t2 = 0 + -5t2 + 5t2
-49 + 2t + 5t2 = -5t2 + 5t2

Combine like terms: -5t2 + 5t2 = 0
-49 + 2t + 5t2 = 0

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

Divide each side by '5'.
-9.8 + 0.4t + t2 = 0

Move the constant term to the right:

Add '9.8' to each side of the equation.
-9.8 + 0.4t + 9.8 + t2 = 0 + 9.8

Reorder the terms:
-9.8 + 9.8 + 0.4t + t2 = 0 + 9.8

Combine like terms: -9.8 + 9.8 = 0.0
0.0 + 0.4t + t2 = 0 + 9.8
0.4t + t2 = 0 + 9.8

Combine like terms: 0 + 9.8 = 9.8
0.4t + t2 = 9.8

The t term is 0.4t.  Take half its coefficient (0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
0.4t + 0.04 + t2 = 9.8 + 0.04

Reorder the terms:
0.04 + 0.4t + t2 = 9.8 + 0.04

Combine like terms: 9.8 + 0.04 = 9.84
0.04 + 0.4t + t2 = 9.84

Factor a perfect square on the left side:
(t + 0.2)(t + 0.2) = 9.84

Calculate the square root of the right side: 3.136877428

Break this problem into two subproblems by setting 
(t + 0.2) equal to 3.136877428 and -3.136877428.

Subproblem 1

t + 0.2 = 3.136877428 Simplifying t + 0.2 = 3.136877428 Reorder the terms: 0.2 + t = 3.136877428 Solving 0.2 + t = 3.136877428 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + t = 3.136877428 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + t = 3.136877428 + -0.2 t = 3.136877428 + -0.2 Combine like terms: 3.136877428 + -0.2 = 2.936877428 t = 2.936877428 Simplifying t = 2.936877428

Subproblem 2

t + 0.2 = -3.136877428 Simplifying t + 0.2 = -3.136877428 Reorder the terms: 0.2 + t = -3.136877428 Solving 0.2 + t = -3.136877428 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + t = -3.136877428 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + t = -3.136877428 + -0.2 t = -3.136877428 + -0.2 Combine like terms: -3.136877428 + -0.2 = -3.336877428 t = -3.336877428 Simplifying t = -3.336877428

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.936877428, -3.336877428}

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