40=56t-4.9t*t

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Solution for 40=56t-4.9t*t equation:


Simplifying
40 = 56t + -4.9t * t

Multiply t * t
40 = 56t + -4.9t2

Solving
40 = 56t + -4.9t2

Solving for variable 't'.

Reorder the terms:
40 + -56t + 4.9t2 = 56t + -56t + -4.9t2 + 4.9t2

Combine like terms: 56t + -56t = 0
40 + -56t + 4.9t2 = 0 + -4.9t2 + 4.9t2
40 + -56t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
40 + -56t + 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'.
8.163265306 + -11.42857143t + t2 = 0

Move the constant term to the right:

Add '-8.163265306' to each side of the equation.
8.163265306 + -11.42857143t + -8.163265306 + t2 = 0 + -8.163265306

Reorder the terms:
8.163265306 + -8.163265306 + -11.42857143t + t2 = 0 + -8.163265306

Combine like terms: 8.163265306 + -8.163265306 = 0.000000000
0.000000000 + -11.42857143t + t2 = 0 + -8.163265306
-11.42857143t + t2 = 0 + -8.163265306

Combine like terms: 0 + -8.163265306 = -8.163265306
-11.42857143t + t2 = -8.163265306

The t term is -11.42857143t.  Take half its coefficient (-5.714285715).
Square it (32.65306123) and add it to both sides.

Add '32.65306123' to each side of the equation.
-11.42857143t + 32.65306123 + t2 = -8.163265306 + 32.65306123

Reorder the terms:
32.65306123 + -11.42857143t + t2 = -8.163265306 + 32.65306123

Combine like terms: -8.163265306 + 32.65306123 = 24.489795924
32.65306123 + -11.42857143t + t2 = 24.489795924

Factor a perfect square on the left side:
(t + -5.714285715)(t + -5.714285715) = 24.489795924

Calculate the square root of the right side: 4.948716594

Break this problem into two subproblems by setting 
(t + -5.714285715) equal to 4.948716594 and -4.948716594.

Subproblem 1

t + -5.714285715 = 4.948716594 Simplifying t + -5.714285715 = 4.948716594 Reorder the terms: -5.714285715 + t = 4.948716594 Solving -5.714285715 + t = 4.948716594 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '5.714285715' to each side of the equation. -5.714285715 + 5.714285715 + t = 4.948716594 + 5.714285715 Combine like terms: -5.714285715 + 5.714285715 = 0.000000000 0.000000000 + t = 4.948716594 + 5.714285715 t = 4.948716594 + 5.714285715 Combine like terms: 4.948716594 + 5.714285715 = 10.663002309 t = 10.663002309 Simplifying t = 10.663002309

Subproblem 2

t + -5.714285715 = -4.948716594 Simplifying t + -5.714285715 = -4.948716594 Reorder the terms: -5.714285715 + t = -4.948716594 Solving -5.714285715 + t = -4.948716594 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '5.714285715' to each side of the equation. -5.714285715 + 5.714285715 + t = -4.948716594 + 5.714285715 Combine like terms: -5.714285715 + 5.714285715 = 0.000000000 0.000000000 + t = -4.948716594 + 5.714285715 t = -4.948716594 + 5.714285715 Combine like terms: -4.948716594 + 5.714285715 = 0.765569121 t = 0.765569121 Simplifying t = 0.765569121

Solution

The solution to the problem is based on the solutions from the subproblems. t = {10.663002309, 0.765569121}

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