22=39t-5t^2

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Solution for 22=39t-5t^2 equation:


Simplifying
22 = 39t + -5t2

Solving
22 = 39t + -5t2

Solving for variable 't'.

Reorder the terms:
22 + -39t + 5t2 = 39t + -39t + -5t2 + 5t2

Combine like terms: 39t + -39t = 0
22 + -39t + 5t2 = 0 + -5t2 + 5t2
22 + -39t + 5t2 = -5t2 + 5t2

Combine like terms: -5t2 + 5t2 = 0
22 + -39t + 5t2 = 0

Begin completing the square.  Divide all terms by
5 the coefficient of the squared term: 

Divide each side by '5'.
4.4 + -7.8t + t2 = 0

Move the constant term to the right:

Add '-4.4' to each side of the equation.
4.4 + -7.8t + -4.4 + t2 = 0 + -4.4

Reorder the terms:
4.4 + -4.4 + -7.8t + t2 = 0 + -4.4

Combine like terms: 4.4 + -4.4 = 0.0
0.0 + -7.8t + t2 = 0 + -4.4
-7.8t + t2 = 0 + -4.4

Combine like terms: 0 + -4.4 = -4.4
-7.8t + t2 = -4.4

The t term is -7.8t.  Take half its coefficient (-3.9).
Square it (15.21) and add it to both sides.

Add '15.21' to each side of the equation.
-7.8t + 15.21 + t2 = -4.4 + 15.21

Reorder the terms:
15.21 + -7.8t + t2 = -4.4 + 15.21

Combine like terms: -4.4 + 15.21 = 10.81
15.21 + -7.8t + t2 = 10.81

Factor a perfect square on the left side:
(t + -3.9)(t + -3.9) = 10.81

Calculate the square root of the right side: 3.287856445

Break this problem into two subproblems by setting 
(t + -3.9) equal to 3.287856445 and -3.287856445.

Subproblem 1

t + -3.9 = 3.287856445 Simplifying t + -3.9 = 3.287856445 Reorder the terms: -3.9 + t = 3.287856445 Solving -3.9 + t = 3.287856445 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3.9' to each side of the equation. -3.9 + 3.9 + t = 3.287856445 + 3.9 Combine like terms: -3.9 + 3.9 = 0.0 0.0 + t = 3.287856445 + 3.9 t = 3.287856445 + 3.9 Combine like terms: 3.287856445 + 3.9 = 7.187856445 t = 7.187856445 Simplifying t = 7.187856445

Subproblem 2

t + -3.9 = -3.287856445 Simplifying t + -3.9 = -3.287856445 Reorder the terms: -3.9 + t = -3.287856445 Solving -3.9 + t = -3.287856445 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3.9' to each side of the equation. -3.9 + 3.9 + t = -3.287856445 + 3.9 Combine like terms: -3.9 + 3.9 = 0.0 0.0 + t = -3.287856445 + 3.9 t = -3.287856445 + 3.9 Combine like terms: -3.287856445 + 3.9 = 0.612143555 t = 0.612143555 Simplifying t = 0.612143555

Solution

The solution to the problem is based on the solutions from the subproblems. t = {7.187856445, 0.612143555}

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