0=20t-5t^2+1.5

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Solution for 0=20t-5t^2+1.5 equation:


Simplifying
0 = 20t + -5t2 + 1.5

Reorder the terms:
0 = 1.5 + 20t + -5t2

Solving
0 = 1.5 + 20t + -5t2

Solving for variable 't'.

Combine like terms: 0 + -1.5 = -1.5
-1.5 + -20t + 5t2 = 1.5 + 20t + -5t2 + -1.5 + -20t + 5t2

Reorder the terms:
-1.5 + -20t + 5t2 = 1.5 + -1.5 + 20t + -20t + -5t2 + 5t2

Combine like terms: 1.5 + -1.5 = 0.0
-1.5 + -20t + 5t2 = 0.0 + 20t + -20t + -5t2 + 5t2
-1.5 + -20t + 5t2 = 20t + -20t + -5t2 + 5t2

Combine like terms: 20t + -20t = 0
-1.5 + -20t + 5t2 = 0 + -5t2 + 5t2
-1.5 + -20t + 5t2 = -5t2 + 5t2

Combine like terms: -5t2 + 5t2 = 0
-1.5 + -20t + 5t2 = 0

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

Divide each side by '5'.
-0.3 + -4t + t2 = 0

Move the constant term to the right:

Add '0.3' to each side of the equation.
-0.3 + -4t + 0.3 + t2 = 0 + 0.3

Reorder the terms:
-0.3 + 0.3 + -4t + t2 = 0 + 0.3

Combine like terms: -0.3 + 0.3 = 0.0
0.0 + -4t + t2 = 0 + 0.3
-4t + t2 = 0 + 0.3

Combine like terms: 0 + 0.3 = 0.3
-4t + t2 = 0.3

The t term is -4t.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4t + 4 + t2 = 0.3 + 4

Reorder the terms:
4 + -4t + t2 = 0.3 + 4

Combine like terms: 0.3 + 4 = 4.3
4 + -4t + t2 = 4.3

Factor a perfect square on the left side:
(t + -2)(t + -2) = 4.3

Calculate the square root of the right side: 2.073644135

Break this problem into two subproblems by setting 
(t + -2) equal to 2.073644135 and -2.073644135.

Subproblem 1

t + -2 = 2.073644135 Simplifying t + -2 = 2.073644135 Reorder the terms: -2 + t = 2.073644135 Solving -2 + t = 2.073644135 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + t = 2.073644135 + 2 Combine like terms: -2 + 2 = 0 0 + t = 2.073644135 + 2 t = 2.073644135 + 2 Combine like terms: 2.073644135 + 2 = 4.073644135 t = 4.073644135 Simplifying t = 4.073644135

Subproblem 2

t + -2 = -2.073644135 Simplifying t + -2 = -2.073644135 Reorder the terms: -2 + t = -2.073644135 Solving -2 + t = -2.073644135 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + t = -2.073644135 + 2 Combine like terms: -2 + 2 = 0 0 + t = -2.073644135 + 2 t = -2.073644135 + 2 Combine like terms: -2.073644135 + 2 = -0.073644135 t = -0.073644135 Simplifying t = -0.073644135

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.073644135, -0.073644135}

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