0=100+10t(0.5)-4.9t^2

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Solution for 0=100+10t(0.5)-4.9t^2 equation:


Simplifying
0 = 100 + 10t(0.5) + -4.9t2

Reorder the terms for easier multiplication:
0 = 100 + 10 * 0.5t + -4.9t2

Multiply 10 * 0.5
0 = 100 + 5t + -4.9t2

Solving
0 = 100 + 5t + -4.9t2

Solving for variable 't'.

Combine like terms: 0 + -100 = -100
-100 + -5t + 4.9t2 = 100 + 5t + -4.9t2 + -100 + -5t + 4.9t2

Reorder the terms:
-100 + -5t + 4.9t2 = 100 + -100 + 5t + -5t + -4.9t2 + 4.9t2

Combine like terms: 100 + -100 = 0
-100 + -5t + 4.9t2 = 0 + 5t + -5t + -4.9t2 + 4.9t2
-100 + -5t + 4.9t2 = 5t + -5t + -4.9t2 + 4.9t2

Combine like terms: 5t + -5t = 0
-100 + -5t + 4.9t2 = 0 + -4.9t2 + 4.9t2
-100 + -5t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
-100 + -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'.
-20.40816327 + -1.020408163t + t2 = 0

Move the constant term to the right:

Add '20.40816327' to each side of the equation.
-20.40816327 + -1.020408163t + 20.40816327 + t2 = 0 + 20.40816327

Reorder the terms:
-20.40816327 + 20.40816327 + -1.020408163t + t2 = 0 + 20.40816327

Combine like terms: -20.40816327 + 20.40816327 = 0.00000000
0.00000000 + -1.020408163t + t2 = 0 + 20.40816327
-1.020408163t + t2 = 0 + 20.40816327

Combine like terms: 0 + 20.40816327 = 20.40816327
-1.020408163t + t2 = 20.40816327

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 = 20.40816327 + 0.2603082048

Reorder the terms:
0.2603082048 + -1.020408163t + t2 = 20.40816327 + 0.2603082048

Combine like terms: 20.40816327 + 0.2603082048 = 20.6684714748
0.2603082048 + -1.020408163t + t2 = 20.6684714748

Factor a perfect square on the left side:
(t + -0.5102040815)(t + -0.5102040815) = 20.6684714748

Calculate the square root of the right side: 4.546259064

Break this problem into two subproblems by setting 
(t + -0.5102040815) equal to 4.546259064 and -4.546259064.

Subproblem 1

t + -0.5102040815 = 4.546259064 Simplifying t + -0.5102040815 = 4.546259064 Reorder the terms: -0.5102040815 + t = 4.546259064 Solving -0.5102040815 + t = 4.546259064 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 = 4.546259064 + 0.5102040815 Combine like terms: -0.5102040815 + 0.5102040815 = 0.0000000000 0.0000000000 + t = 4.546259064 + 0.5102040815 t = 4.546259064 + 0.5102040815 Combine like terms: 4.546259064 + 0.5102040815 = 5.0564631455 t = 5.0564631455 Simplifying t = 5.0564631455

Subproblem 2

t + -0.5102040815 = -4.546259064 Simplifying t + -0.5102040815 = -4.546259064 Reorder the terms: -0.5102040815 + t = -4.546259064 Solving -0.5102040815 + t = -4.546259064 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 = -4.546259064 + 0.5102040815 Combine like terms: -0.5102040815 + 0.5102040815 = 0.0000000000 0.0000000000 + t = -4.546259064 + 0.5102040815 t = -4.546259064 + 0.5102040815 Combine like terms: -4.546259064 + 0.5102040815 = -4.0360549825 t = -4.0360549825 Simplifying t = -4.0360549825

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.0564631455, -4.0360549825}

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