-245=63.1906*t+.5*-9.8*t^2

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Solution for -245=63.1906*t+.5*-9.8*t^2 equation:


Simplifying
-245 = 63.1906t + 0.5 * -9.8t2

Multiply 0.5 * -9.8
-245 = 63.1906t + -4.9t2

Solving
-245 = 63.1906t + -4.9t2

Solving for variable 't'.

Reorder the terms:
-245 + -63.1906t + 4.9t2 = 63.1906t + -63.1906t + -4.9t2 + 4.9t2

Combine like terms: 63.1906t + -63.1906t = 0.0000
-245 + -63.1906t + 4.9t2 = 0.0000 + -4.9t2 + 4.9t2
-245 + -63.1906t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
-245 + -63.1906t + 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'.
-50 + -12.89604082t + t2 = 0

Move the constant term to the right:

Add '50' to each side of the equation.
-50 + -12.89604082t + 50 + t2 = 0 + 50

Reorder the terms:
-50 + 50 + -12.89604082t + t2 = 0 + 50

Combine like terms: -50 + 50 = 0
0 + -12.89604082t + t2 = 0 + 50
-12.89604082t + t2 = 0 + 50

Combine like terms: 0 + 50 = 50
-12.89604082t + t2 = 50

The t term is -12.89604082t.  Take half its coefficient (-6.44802041).
Square it (41.57696721) and add it to both sides.

Add '41.57696721' to each side of the equation.
-12.89604082t + 41.57696721 + t2 = 50 + 41.57696721

Reorder the terms:
41.57696721 + -12.89604082t + t2 = 50 + 41.57696721

Combine like terms: 50 + 41.57696721 = 91.57696721
41.57696721 + -12.89604082t + t2 = 91.57696721

Factor a perfect square on the left side:
(t + -6.44802041)(t + -6.44802041) = 91.57696721

Calculate the square root of the right side: 9.56958553

Break this problem into two subproblems by setting 
(t + -6.44802041) equal to 9.56958553 and -9.56958553.

Subproblem 1

t + -6.44802041 = 9.56958553 Simplifying t + -6.44802041 = 9.56958553 Reorder the terms: -6.44802041 + t = 9.56958553 Solving -6.44802041 + t = 9.56958553 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '6.44802041' to each side of the equation. -6.44802041 + 6.44802041 + t = 9.56958553 + 6.44802041 Combine like terms: -6.44802041 + 6.44802041 = 0.00000000 0.00000000 + t = 9.56958553 + 6.44802041 t = 9.56958553 + 6.44802041 Combine like terms: 9.56958553 + 6.44802041 = 16.01760594 t = 16.01760594 Simplifying t = 16.01760594

Subproblem 2

t + -6.44802041 = -9.56958553 Simplifying t + -6.44802041 = -9.56958553 Reorder the terms: -6.44802041 + t = -9.56958553 Solving -6.44802041 + t = -9.56958553 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '6.44802041' to each side of the equation. -6.44802041 + 6.44802041 + t = -9.56958553 + 6.44802041 Combine like terms: -6.44802041 + 6.44802041 = 0.00000000 0.00000000 + t = -9.56958553 + 6.44802041 t = -9.56958553 + 6.44802041 Combine like terms: -9.56958553 + 6.44802041 = -3.12156512 t = -3.12156512 Simplifying t = -3.12156512

Solution

The solution to the problem is based on the solutions from the subproblems. t = {16.01760594, -3.12156512}

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