11=9t-0.3t^2

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Solution for 11=9t-0.3t^2 equation:


Simplifying
11 = 9t + -0.3t2

Solving
11 = 9t + -0.3t2

Solving for variable 't'.

Reorder the terms:
11 + -9t + 0.3t2 = 9t + -9t + -0.3t2 + 0.3t2

Combine like terms: 9t + -9t = 0
11 + -9t + 0.3t2 = 0 + -0.3t2 + 0.3t2
11 + -9t + 0.3t2 = -0.3t2 + 0.3t2

Combine like terms: -0.3t2 + 0.3t2 = 0.0
11 + -9t + 0.3t2 = 0.0

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

Divide each side by '0.3'.
36.66666667 + -30t + t2 = 0

Move the constant term to the right:

Add '-36.66666667' to each side of the equation.
36.66666667 + -30t + -36.66666667 + t2 = 0 + -36.66666667

Reorder the terms:
36.66666667 + -36.66666667 + -30t + t2 = 0 + -36.66666667

Combine like terms: 36.66666667 + -36.66666667 = 0.00000000
0.00000000 + -30t + t2 = 0 + -36.66666667
-30t + t2 = 0 + -36.66666667

Combine like terms: 0 + -36.66666667 = -36.66666667
-30t + t2 = -36.66666667

The t term is -30t.  Take half its coefficient (-15).
Square it (225) and add it to both sides.

Add '225' to each side of the equation.
-30t + 225 + t2 = -36.66666667 + 225

Reorder the terms:
225 + -30t + t2 = -36.66666667 + 225

Combine like terms: -36.66666667 + 225 = 188.33333333
225 + -30t + t2 = 188.33333333

Factor a perfect square on the left side:
(t + -15)(t + -15) = 188.33333333

Calculate the square root of the right side: 13.723459233

Break this problem into two subproblems by setting 
(t + -15) equal to 13.723459233 and -13.723459233.

Subproblem 1

t + -15 = 13.723459233 Simplifying t + -15 = 13.723459233 Reorder the terms: -15 + t = 13.723459233 Solving -15 + t = 13.723459233 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + t = 13.723459233 + 15 Combine like terms: -15 + 15 = 0 0 + t = 13.723459233 + 15 t = 13.723459233 + 15 Combine like terms: 13.723459233 + 15 = 28.723459233 t = 28.723459233 Simplifying t = 28.723459233

Subproblem 2

t + -15 = -13.723459233 Simplifying t + -15 = -13.723459233 Reorder the terms: -15 + t = -13.723459233 Solving -15 + t = -13.723459233 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + t = -13.723459233 + 15 Combine like terms: -15 + 15 = 0 0 + t = -13.723459233 + 15 t = -13.723459233 + 15 Combine like terms: -13.723459233 + 15 = 1.276540767 t = 1.276540767 Simplifying t = 1.276540767

Solution

The solution to the problem is based on the solutions from the subproblems. t = {28.723459233, 1.276540767}

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