0=-4.9t^2+13t+700

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Solution for 0=-4.9t^2+13t+700 equation:


Simplifying
0 = -4.9t2 + 13t + 700

Reorder the terms:
0 = 700 + 13t + -4.9t2

Solving
0 = 700 + 13t + -4.9t2

Solving for variable 't'.

Combine like terms: 0 + -700 = -700
-700 + -13t + 4.9t2 = 700 + 13t + -4.9t2 + -700 + -13t + 4.9t2

Reorder the terms:
-700 + -13t + 4.9t2 = 700 + -700 + 13t + -13t + -4.9t2 + 4.9t2

Combine like terms: 700 + -700 = 0
-700 + -13t + 4.9t2 = 0 + 13t + -13t + -4.9t2 + 4.9t2
-700 + -13t + 4.9t2 = 13t + -13t + -4.9t2 + 4.9t2

Combine like terms: 13t + -13t = 0
-700 + -13t + 4.9t2 = 0 + -4.9t2 + 4.9t2
-700 + -13t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
-700 + -13t + 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'.
-142.8571429 + -2.653061224t + t2 = 0

Move the constant term to the right:

Add '142.8571429' to each side of the equation.
-142.8571429 + -2.653061224t + 142.8571429 + t2 = 0 + 142.8571429

Reorder the terms:
-142.8571429 + 142.8571429 + -2.653061224t + t2 = 0 + 142.8571429

Combine like terms: -142.8571429 + 142.8571429 = 0.0000000
0.0000000 + -2.653061224t + t2 = 0 + 142.8571429
-2.653061224t + t2 = 0 + 142.8571429

Combine like terms: 0 + 142.8571429 = 142.8571429
-2.653061224t + t2 = 142.8571429

The t term is -2.653061224t.  Take half its coefficient (-1.326530612).
Square it (1.759683465) and add it to both sides.

Add '1.759683465' to each side of the equation.
-2.653061224t + 1.759683465 + t2 = 142.8571429 + 1.759683465

Reorder the terms:
1.759683465 + -2.653061224t + t2 = 142.8571429 + 1.759683465

Combine like terms: 142.8571429 + 1.759683465 = 144.616826365
1.759683465 + -2.653061224t + t2 = 144.616826365

Factor a perfect square on the left side:
(t + -1.326530612)(t + -1.326530612) = 144.616826365

Calculate the square root of the right side: 12.025673635

Break this problem into two subproblems by setting 
(t + -1.326530612) equal to 12.025673635 and -12.025673635.

Subproblem 1

t + -1.326530612 = 12.025673635 Simplifying t + -1.326530612 = 12.025673635 Reorder the terms: -1.326530612 + t = 12.025673635 Solving -1.326530612 + t = 12.025673635 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.326530612' to each side of the equation. -1.326530612 + 1.326530612 + t = 12.025673635 + 1.326530612 Combine like terms: -1.326530612 + 1.326530612 = 0.000000000 0.000000000 + t = 12.025673635 + 1.326530612 t = 12.025673635 + 1.326530612 Combine like terms: 12.025673635 + 1.326530612 = 13.352204247 t = 13.352204247 Simplifying t = 13.352204247

Subproblem 2

t + -1.326530612 = -12.025673635 Simplifying t + -1.326530612 = -12.025673635 Reorder the terms: -1.326530612 + t = -12.025673635 Solving -1.326530612 + t = -12.025673635 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '1.326530612' to each side of the equation. -1.326530612 + 1.326530612 + t = -12.025673635 + 1.326530612 Combine like terms: -1.326530612 + 1.326530612 = 0.000000000 0.000000000 + t = -12.025673635 + 1.326530612 t = -12.025673635 + 1.326530612 Combine like terms: -12.025673635 + 1.326530612 = -10.699143023 t = -10.699143023 Simplifying t = -10.699143023

Solution

The solution to the problem is based on the solutions from the subproblems. t = {13.352204247, -10.699143023}

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