t=45-5t-5t^2

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Solution for t=45-5t-5t^2 equation:


Simplifying
t = 45 + -5t + -5t2

Solving
t = 45 + -5t + -5t2

Solving for variable 't'.

Reorder the terms:
-45 + t + 5t + 5t2 = 45 + -5t + -5t2 + -45 + 5t + 5t2

Combine like terms: t + 5t = 6t
-45 + 6t + 5t2 = 45 + -5t + -5t2 + -45 + 5t + 5t2

Reorder the terms:
-45 + 6t + 5t2 = 45 + -45 + -5t + 5t + -5t2 + 5t2

Combine like terms: 45 + -45 = 0
-45 + 6t + 5t2 = 0 + -5t + 5t + -5t2 + 5t2
-45 + 6t + 5t2 = -5t + 5t + -5t2 + 5t2

Combine like terms: -5t + 5t = 0
-45 + 6t + 5t2 = 0 + -5t2 + 5t2
-45 + 6t + 5t2 = -5t2 + 5t2

Combine like terms: -5t2 + 5t2 = 0
-45 + 6t + 5t2 = 0

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

Divide each side by '5'.
-9 + 1.2t + t2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + 1.2t + 9 + t2 = 0 + 9

Reorder the terms:
-9 + 9 + 1.2t + t2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 1.2t + t2 = 0 + 9
1.2t + t2 = 0 + 9

Combine like terms: 0 + 9 = 9
1.2t + t2 = 9

The t term is 1.2t.  Take half its coefficient (0.6).
Square it (0.36) and add it to both sides.

Add '0.36' to each side of the equation.
1.2t + 0.36 + t2 = 9 + 0.36

Reorder the terms:
0.36 + 1.2t + t2 = 9 + 0.36

Combine like terms: 9 + 0.36 = 9.36
0.36 + 1.2t + t2 = 9.36

Factor a perfect square on the left side:
(t + 0.6)(t + 0.6) = 9.36

Calculate the square root of the right side: 3.059411708

Break this problem into two subproblems by setting 
(t + 0.6) equal to 3.059411708 and -3.059411708.

Subproblem 1

t + 0.6 = 3.059411708 Simplifying t + 0.6 = 3.059411708 Reorder the terms: 0.6 + t = 3.059411708 Solving 0.6 + t = 3.059411708 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.6' to each side of the equation. 0.6 + -0.6 + t = 3.059411708 + -0.6 Combine like terms: 0.6 + -0.6 = 0.0 0.0 + t = 3.059411708 + -0.6 t = 3.059411708 + -0.6 Combine like terms: 3.059411708 + -0.6 = 2.459411708 t = 2.459411708 Simplifying t = 2.459411708

Subproblem 2

t + 0.6 = -3.059411708 Simplifying t + 0.6 = -3.059411708 Reorder the terms: 0.6 + t = -3.059411708 Solving 0.6 + t = -3.059411708 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.6' to each side of the equation. 0.6 + -0.6 + t = -3.059411708 + -0.6 Combine like terms: 0.6 + -0.6 = 0.0 0.0 + t = -3.059411708 + -0.6 t = -3.059411708 + -0.6 Combine like terms: -3.059411708 + -0.6 = -3.659411708 t = -3.659411708 Simplifying t = -3.659411708

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.459411708, -3.659411708}

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