120=18t-.6t^2

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Solution for 120=18t-.6t^2 equation:


Simplifying
120 = 18t + -0.6t2

Solving
120 = 18t + -0.6t2

Solving for variable 't'.

Reorder the terms:
120 + -18t + 0.6t2 = 18t + -18t + -0.6t2 + 0.6t2

Combine like terms: 18t + -18t = 0
120 + -18t + 0.6t2 = 0 + -0.6t2 + 0.6t2
120 + -18t + 0.6t2 = -0.6t2 + 0.6t2

Combine like terms: -0.6t2 + 0.6t2 = 0.0
120 + -18t + 0.6t2 = 0.0

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

Divide each side by '0.6'.
200 + -30t + t2 = 0

Move the constant term to the right:

Add '-200' to each side of the equation.
200 + -30t + -200 + t2 = 0 + -200

Reorder the terms:
200 + -200 + -30t + t2 = 0 + -200

Combine like terms: 200 + -200 = 0
0 + -30t + t2 = 0 + -200
-30t + t2 = 0 + -200

Combine like terms: 0 + -200 = -200
-30t + t2 = -200

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 = -200 + 225

Reorder the terms:
225 + -30t + t2 = -200 + 225

Combine like terms: -200 + 225 = 25
225 + -30t + t2 = 25

Factor a perfect square on the left side:
(t + -15)(t + -15) = 25

Calculate the square root of the right side: 5

Break this problem into two subproblems by setting 
(t + -15) equal to 5 and -5.

Subproblem 1

t + -15 = 5 Simplifying t + -15 = 5 Reorder the terms: -15 + t = 5 Solving -15 + t = 5 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 = 5 + 15 Combine like terms: -15 + 15 = 0 0 + t = 5 + 15 t = 5 + 15 Combine like terms: 5 + 15 = 20 t = 20 Simplifying t = 20

Subproblem 2

t + -15 = -5 Simplifying t + -15 = -5 Reorder the terms: -15 + t = -5 Solving -15 + t = -5 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 = -5 + 15 Combine like terms: -15 + 15 = 0 0 + t = -5 + 15 t = -5 + 15 Combine like terms: -5 + 15 = 10 t = 10 Simplifying t = 10

Solution

The solution to the problem is based on the solutions from the subproblems. t = {20, 10}

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