12=38T-4.9T^2

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Solution for 12=38T-4.9T^2 equation:


Simplifying
12 = 38T + -4.9T2

Solving
12 = 38T + -4.9T2

Solving for variable 'T'.

Reorder the terms:
12 + -38T + 4.9T2 = 38T + -38T + -4.9T2 + 4.9T2

Combine like terms: 38T + -38T = 0
12 + -38T + 4.9T2 = 0 + -4.9T2 + 4.9T2
12 + -38T + 4.9T2 = -4.9T2 + 4.9T2

Combine like terms: -4.9T2 + 4.9T2 = 0.0
12 + -38T + 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'.
2.448979592 + -7.755102041T + T2 = 0

Move the constant term to the right:

Add '-2.448979592' to each side of the equation.
2.448979592 + -7.755102041T + -2.448979592 + T2 = 0 + -2.448979592

Reorder the terms:
2.448979592 + -2.448979592 + -7.755102041T + T2 = 0 + -2.448979592

Combine like terms: 2.448979592 + -2.448979592 = 0.000000000
0.000000000 + -7.755102041T + T2 = 0 + -2.448979592
-7.755102041T + T2 = 0 + -2.448979592

Combine like terms: 0 + -2.448979592 = -2.448979592
-7.755102041T + T2 = -2.448979592

The T term is -7.755102041T.  Take half its coefficient (-3.877551021).
Square it (15.03540192) and add it to both sides.

Add '15.03540192' to each side of the equation.
-7.755102041T + 15.03540192 + T2 = -2.448979592 + 15.03540192

Reorder the terms:
15.03540192 + -7.755102041T + T2 = -2.448979592 + 15.03540192

Combine like terms: -2.448979592 + 15.03540192 = 12.586422328
15.03540192 + -7.755102041T + T2 = 12.586422328

Factor a perfect square on the left side:
(T + -3.877551021)(T + -3.877551021) = 12.586422328

Calculate the square root of the right side: 3.547734816

Break this problem into two subproblems by setting 
(T + -3.877551021) equal to 3.547734816 and -3.547734816.

Subproblem 1

T + -3.877551021 = 3.547734816 Simplifying T + -3.877551021 = 3.547734816 Reorder the terms: -3.877551021 + T = 3.547734816 Solving -3.877551021 + T = 3.547734816 Solving for variable 'T'. Move all terms containing T to the left, all other terms to the right. Add '3.877551021' to each side of the equation. -3.877551021 + 3.877551021 + T = 3.547734816 + 3.877551021 Combine like terms: -3.877551021 + 3.877551021 = 0.000000000 0.000000000 + T = 3.547734816 + 3.877551021 T = 3.547734816 + 3.877551021 Combine like terms: 3.547734816 + 3.877551021 = 7.425285837 T = 7.425285837 Simplifying T = 7.425285837

Subproblem 2

T + -3.877551021 = -3.547734816 Simplifying T + -3.877551021 = -3.547734816 Reorder the terms: -3.877551021 + T = -3.547734816 Solving -3.877551021 + T = -3.547734816 Solving for variable 'T'. Move all terms containing T to the left, all other terms to the right. Add '3.877551021' to each side of the equation. -3.877551021 + 3.877551021 + T = -3.547734816 + 3.877551021 Combine like terms: -3.877551021 + 3.877551021 = 0.000000000 0.000000000 + T = -3.547734816 + 3.877551021 T = -3.547734816 + 3.877551021 Combine like terms: -3.547734816 + 3.877551021 = 0.329816205 T = 0.329816205 Simplifying T = 0.329816205

Solution

The solution to the problem is based on the solutions from the subproblems. T = {7.425285837, 0.329816205}

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