354=35t+.5*9.8*t^2

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Solution for 354=35t+.5*9.8*t^2 equation:


Simplifying
354 = 35t + 0.5 * 9.8t2

Multiply 0.5 * 9.8
354 = 35t + 4.9t2

Solving
354 = 35t + 4.9t2

Solving for variable 't'.

Reorder the terms:
354 + -35t + -4.9t2 = 35t + -35t + 4.9t2 + -4.9t2

Combine like terms: 35t + -35t = 0
354 + -35t + -4.9t2 = 0 + 4.9t2 + -4.9t2
354 + -35t + -4.9t2 = 4.9t2 + -4.9t2

Combine like terms: 4.9t2 + -4.9t2 = 0.0
354 + -35t + -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'.
-72.24489796 + 7.142857143t + t2 = 0

Move the constant term to the right:

Add '72.24489796' to each side of the equation.
-72.24489796 + 7.142857143t + 72.24489796 + t2 = 0 + 72.24489796

Reorder the terms:
-72.24489796 + 72.24489796 + 7.142857143t + t2 = 0 + 72.24489796

Combine like terms: -72.24489796 + 72.24489796 = 0.00000000
0.00000000 + 7.142857143t + t2 = 0 + 72.24489796
7.142857143t + t2 = 0 + 72.24489796

Combine like terms: 0 + 72.24489796 = 72.24489796
7.142857143t + t2 = 72.24489796

The t term is 7.142857143t.  Take half its coefficient (3.571428572).
Square it (12.75510204) and add it to both sides.

Add '12.75510204' to each side of the equation.
7.142857143t + 12.75510204 + t2 = 72.24489796 + 12.75510204

Reorder the terms:
12.75510204 + 7.142857143t + t2 = 72.24489796 + 12.75510204

Combine like terms: 72.24489796 + 12.75510204 = 85
12.75510204 + 7.142857143t + t2 = 85

Factor a perfect square on the left side:
(t + 3.571428572)(t + 3.571428572) = 85

Calculate the square root of the right side: 9.219544457

Break this problem into two subproblems by setting 
(t + 3.571428572) equal to 9.219544457 and -9.219544457.

Subproblem 1

t + 3.571428572 = 9.219544457 Simplifying t + 3.571428572 = 9.219544457 Reorder the terms: 3.571428572 + t = 9.219544457 Solving 3.571428572 + t = 9.219544457 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-3.571428572' to each side of the equation. 3.571428572 + -3.571428572 + t = 9.219544457 + -3.571428572 Combine like terms: 3.571428572 + -3.571428572 = 0.000000000 0.000000000 + t = 9.219544457 + -3.571428572 t = 9.219544457 + -3.571428572 Combine like terms: 9.219544457 + -3.571428572 = 5.648115885 t = 5.648115885 Simplifying t = 5.648115885

Subproblem 2

t + 3.571428572 = -9.219544457 Simplifying t + 3.571428572 = -9.219544457 Reorder the terms: 3.571428572 + t = -9.219544457 Solving 3.571428572 + t = -9.219544457 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-3.571428572' to each side of the equation. 3.571428572 + -3.571428572 + t = -9.219544457 + -3.571428572 Combine like terms: 3.571428572 + -3.571428572 = 0.000000000 0.000000000 + t = -9.219544457 + -3.571428572 t = -9.219544457 + -3.571428572 Combine like terms: -9.219544457 + -3.571428572 = -12.790973029 t = -12.790973029 Simplifying t = -12.790973029

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.648115885, -12.790973029}

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