1960=245t-4.9t^2

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Solution for 1960=245t-4.9t^2 equation:


Simplifying
1960 = 245t + -4.9t2

Solving
1960 = 245t + -4.9t2

Solving for variable 't'.

Reorder the terms:
1960 + -245t + 4.9t2 = 245t + -245t + -4.9t2 + 4.9t2

Combine like terms: 245t + -245t = 0
1960 + -245t + 4.9t2 = 0 + -4.9t2 + 4.9t2
1960 + -245t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
1960 + -245t + 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'.
400 + -50t + t2 = 0

Move the constant term to the right:

Add '-400' to each side of the equation.
400 + -50t + -400 + t2 = 0 + -400

Reorder the terms:
400 + -400 + -50t + t2 = 0 + -400

Combine like terms: 400 + -400 = 0
0 + -50t + t2 = 0 + -400
-50t + t2 = 0 + -400

Combine like terms: 0 + -400 = -400
-50t + t2 = -400

The t term is -50t.  Take half its coefficient (-25).
Square it (625) and add it to both sides.

Add '625' to each side of the equation.
-50t + 625 + t2 = -400 + 625

Reorder the terms:
625 + -50t + t2 = -400 + 625

Combine like terms: -400 + 625 = 225
625 + -50t + t2 = 225

Factor a perfect square on the left side:
(t + -25)(t + -25) = 225

Calculate the square root of the right side: 15

Break this problem into two subproblems by setting 
(t + -25) equal to 15 and -15.

Subproblem 1

t + -25 = 15 Simplifying t + -25 = 15 Reorder the terms: -25 + t = 15 Solving -25 + t = 15 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '25' to each side of the equation. -25 + 25 + t = 15 + 25 Combine like terms: -25 + 25 = 0 0 + t = 15 + 25 t = 15 + 25 Combine like terms: 15 + 25 = 40 t = 40 Simplifying t = 40

Subproblem 2

t + -25 = -15 Simplifying t + -25 = -15 Reorder the terms: -25 + t = -15 Solving -25 + t = -15 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '25' to each side of the equation. -25 + 25 + t = -15 + 25 Combine like terms: -25 + 25 = 0 0 + t = -15 + 25 t = -15 + 25 Combine like terms: -15 + 25 = 10 t = 10 Simplifying t = 10

Solution

The solution to the problem is based on the solutions from the subproblems. t = {40, 10}

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