36=-4.5t^2+27t

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Solution for 36=-4.5t^2+27t equation:


Simplifying
36 = -4.5t2 + 27t

Reorder the terms:
36 = 27t + -4.5t2

Solving
36 = 27t + -4.5t2

Solving for variable 't'.

Reorder the terms:
36 + -27t + 4.5t2 = 27t + -27t + -4.5t2 + 4.5t2

Combine like terms: 27t + -27t = 0
36 + -27t + 4.5t2 = 0 + -4.5t2 + 4.5t2
36 + -27t + 4.5t2 = -4.5t2 + 4.5t2

Combine like terms: -4.5t2 + 4.5t2 = 0.0
36 + -27t + 4.5t2 = 0.0

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

Divide each side by '4.5'.
8 + -6t + t2 = 0

Move the constant term to the right:

Add '-8' to each side of the equation.
8 + -6t + -8 + t2 = 0 + -8

Reorder the terms:
8 + -8 + -6t + t2 = 0 + -8

Combine like terms: 8 + -8 = 0
0 + -6t + t2 = 0 + -8
-6t + t2 = 0 + -8

Combine like terms: 0 + -8 = -8
-6t + t2 = -8

The t term is -6t.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6t + 9 + t2 = -8 + 9

Reorder the terms:
9 + -6t + t2 = -8 + 9

Combine like terms: -8 + 9 = 1
9 + -6t + t2 = 1

Factor a perfect square on the left side:
(t + -3)(t + -3) = 1

Calculate the square root of the right side: 1

Break this problem into two subproblems by setting 
(t + -3) equal to 1 and -1.

Subproblem 1

t + -3 = 1 Simplifying t + -3 = 1 Reorder the terms: -3 + t = 1 Solving -3 + t = 1 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + t = 1 + 3 Combine like terms: -3 + 3 = 0 0 + t = 1 + 3 t = 1 + 3 Combine like terms: 1 + 3 = 4 t = 4 Simplifying t = 4

Subproblem 2

t + -3 = -1 Simplifying t + -3 = -1 Reorder the terms: -3 + t = -1 Solving -3 + t = -1 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + t = -1 + 3 Combine like terms: -3 + 3 = 0 0 + t = -1 + 3 t = -1 + 3 Combine like terms: -1 + 3 = 2 t = 2 Simplifying t = 2

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4, 2}

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