17.5=20t-2.5t^2

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Solution for 17.5=20t-2.5t^2 equation:


Simplifying
17.5 = 20t + -2.5t2

Solving
17.5 = 20t + -2.5t2

Solving for variable 't'.

Reorder the terms:
17.5 + -20t + 2.5t2 = 20t + -20t + -2.5t2 + 2.5t2

Combine like terms: 20t + -20t = 0
17.5 + -20t + 2.5t2 = 0 + -2.5t2 + 2.5t2
17.5 + -20t + 2.5t2 = -2.5t2 + 2.5t2

Combine like terms: -2.5t2 + 2.5t2 = 0.0
17.5 + -20t + 2.5t2 = 0.0

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

Divide each side by '2.5'.
7 + -8t + t2 = 0

Move the constant term to the right:

Add '-7' to each side of the equation.
7 + -8t + -7 + t2 = 0 + -7

Reorder the terms:
7 + -7 + -8t + t2 = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -8t + t2 = 0 + -7
-8t + t2 = 0 + -7

Combine like terms: 0 + -7 = -7
-8t + t2 = -7

The t term is -8t.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8t + 16 + t2 = -7 + 16

Reorder the terms:
16 + -8t + t2 = -7 + 16

Combine like terms: -7 + 16 = 9
16 + -8t + t2 = 9

Factor a perfect square on the left side:
(t + -4)(t + -4) = 9

Calculate the square root of the right side: 3

Break this problem into two subproblems by setting 
(t + -4) equal to 3 and -3.

Subproblem 1

t + -4 = 3 Simplifying t + -4 = 3 Reorder the terms: -4 + t = 3 Solving -4 + t = 3 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + t = 3 + 4 Combine like terms: -4 + 4 = 0 0 + t = 3 + 4 t = 3 + 4 Combine like terms: 3 + 4 = 7 t = 7 Simplifying t = 7

Subproblem 2

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

Solution

The solution to the problem is based on the solutions from the subproblems. t = {7, 1}

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