0.5t=0.8-4.9t^2

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Solution for 0.5t=0.8-4.9t^2 equation:


Simplifying
0.5t = 0.8 + -4.9t2

Solving
0.5t = 0.8 + -4.9t2

Solving for variable 't'.

Reorder the terms:
-0.8 + 0.5t + 4.9t2 = 0.8 + -4.9t2 + -0.8 + 4.9t2

Reorder the terms:
-0.8 + 0.5t + 4.9t2 = 0.8 + -0.8 + -4.9t2 + 4.9t2

Combine like terms: 0.8 + -0.8 = 0.0
-0.8 + 0.5t + 4.9t2 = 0.0 + -4.9t2 + 4.9t2
-0.8 + 0.5t + 4.9t2 = -4.9t2 + 4.9t2

Combine like terms: -4.9t2 + 4.9t2 = 0.0
-0.8 + 0.5t + 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'.
-0.1632653061 + 0.1020408163t + t2 = 0

Move the constant term to the right:

Add '0.1632653061' to each side of the equation.
-0.1632653061 + 0.1020408163t + 0.1632653061 + t2 = 0 + 0.1632653061

Reorder the terms:
-0.1632653061 + 0.1632653061 + 0.1020408163t + t2 = 0 + 0.1632653061

Combine like terms: -0.1632653061 + 0.1632653061 = 0.0000000000
0.0000000000 + 0.1020408163t + t2 = 0 + 0.1632653061
0.1020408163t + t2 = 0 + 0.1632653061

Combine like terms: 0 + 0.1632653061 = 0.1632653061
0.1020408163t + t2 = 0.1632653061

The t term is 0.1020408163t.  Take half its coefficient (0.05102040815).
Square it (0.002603082048) and add it to both sides.

Add '0.002603082048' to each side of the equation.
0.1020408163t + 0.002603082048 + t2 = 0.1632653061 + 0.002603082048

Reorder the terms:
0.002603082048 + 0.1020408163t + t2 = 0.1632653061 + 0.002603082048

Combine like terms: 0.1632653061 + 0.002603082048 = 0.165868388148
0.002603082048 + 0.1020408163t + t2 = 0.165868388148

Factor a perfect square on the left side:
(t + 0.05102040815)(t + 0.05102040815) = 0.165868388148

Calculate the square root of the right side: 0.407269429

Break this problem into two subproblems by setting 
(t + 0.05102040815) equal to 0.407269429 and -0.407269429.

Subproblem 1

t + 0.05102040815 = 0.407269429 Simplifying t + 0.05102040815 = 0.407269429 Reorder the terms: 0.05102040815 + t = 0.407269429 Solving 0.05102040815 + t = 0.407269429 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.05102040815' to each side of the equation. 0.05102040815 + -0.05102040815 + t = 0.407269429 + -0.05102040815 Combine like terms: 0.05102040815 + -0.05102040815 = 0.00000000000 0.00000000000 + t = 0.407269429 + -0.05102040815 t = 0.407269429 + -0.05102040815 Combine like terms: 0.407269429 + -0.05102040815 = 0.35624902085 t = 0.35624902085 Simplifying t = 0.35624902085

Subproblem 2

t + 0.05102040815 = -0.407269429 Simplifying t + 0.05102040815 = -0.407269429 Reorder the terms: 0.05102040815 + t = -0.407269429 Solving 0.05102040815 + t = -0.407269429 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.05102040815' to each side of the equation. 0.05102040815 + -0.05102040815 + t = -0.407269429 + -0.05102040815 Combine like terms: 0.05102040815 + -0.05102040815 = 0.00000000000 0.00000000000 + t = -0.407269429 + -0.05102040815 t = -0.407269429 + -0.05102040815 Combine like terms: -0.407269429 + -0.05102040815 = -0.45828983715 t = -0.45828983715 Simplifying t = -0.45828983715

Solution

The solution to the problem is based on the solutions from the subproblems. t = {0.35624902085, -0.45828983715}

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