-40=5t-4.9t^2

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Solution for -40=5t-4.9t^2 equation:


Simplifying
-40 = 5t + -4.9t2

Solving
-40 = 5t + -4.9t2

Solving for variable 't'.

Reorder the terms:
-40 + -5t + 4.9t2 = 5t + -5t + -4.9t2 + 4.9t2

Combine like terms: 5t + -5t = 0
-40 + -5t + 4.9t2 = 0 + -4.9t2 + 4.9t2
-40 + -5t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
-40 + -5t + 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 + -1.020408163t + t2 = 0

Move the constant term to the right:

Add '8.163265306' to each side of the equation.
-8.163265306 + -1.020408163t + 8.163265306 + t2 = 0 + 8.163265306

Reorder the terms:
-8.163265306 + 8.163265306 + -1.020408163t + t2 = 0 + 8.163265306

Combine like terms: -8.163265306 + 8.163265306 = 0.000000000
0.000000000 + -1.020408163t + t2 = 0 + 8.163265306
-1.020408163t + t2 = 0 + 8.163265306

Combine like terms: 0 + 8.163265306 = 8.163265306
-1.020408163t + t2 = 8.163265306

The t term is -1.020408163t.  Take half its coefficient (-0.5102040815).
Square it (0.2603082048) and add it to both sides.

Add '0.2603082048' to each side of the equation.
-1.020408163t + 0.2603082048 + t2 = 8.163265306 + 0.2603082048

Reorder the terms:
0.2603082048 + -1.020408163t + t2 = 8.163265306 + 0.2603082048

Combine like terms: 8.163265306 + 0.2603082048 = 8.4235735108
0.2603082048 + -1.020408163t + t2 = 8.4235735108

Factor a perfect square on the left side:
(t + -0.5102040815)(t + -0.5102040815) = 8.4235735108

Calculate the square root of the right side: 2.902339317

Break this problem into two subproblems by setting 
(t + -0.5102040815) equal to 2.902339317 and -2.902339317.

Subproblem 1

t + -0.5102040815 = 2.902339317 Simplifying t + -0.5102040815 = 2.902339317 Reorder the terms: -0.5102040815 + t = 2.902339317 Solving -0.5102040815 + t = 2.902339317 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.5102040815' to each side of the equation. -0.5102040815 + 0.5102040815 + t = 2.902339317 + 0.5102040815 Combine like terms: -0.5102040815 + 0.5102040815 = 0.0000000000 0.0000000000 + t = 2.902339317 + 0.5102040815 t = 2.902339317 + 0.5102040815 Combine like terms: 2.902339317 + 0.5102040815 = 3.4125433985 t = 3.4125433985 Simplifying t = 3.4125433985

Subproblem 2

t + -0.5102040815 = -2.902339317 Simplifying t + -0.5102040815 = -2.902339317 Reorder the terms: -0.5102040815 + t = -2.902339317 Solving -0.5102040815 + t = -2.902339317 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.5102040815' to each side of the equation. -0.5102040815 + 0.5102040815 + t = -2.902339317 + 0.5102040815 Combine like terms: -0.5102040815 + 0.5102040815 = 0.0000000000 0.0000000000 + t = -2.902339317 + 0.5102040815 t = -2.902339317 + 0.5102040815 Combine like terms: -2.902339317 + 0.5102040815 = -2.3921352355 t = -2.3921352355 Simplifying t = -2.3921352355

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.4125433985, -2.3921352355}

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