0=.45t^2+18t-75

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Solution for 0=.45t^2+18t-75 equation:


Simplifying
0 = 0.45t2 + 18t + -75

Reorder the terms:
0 = -75 + 18t + 0.45t2

Solving
0 = -75 + 18t + 0.45t2

Solving for variable 't'.

Combine like terms: 0 + 75 = 75
75 + -18t + -0.45t2 = -75 + 18t + 0.45t2 + 75 + -18t + -0.45t2

Reorder the terms:
75 + -18t + -0.45t2 = -75 + 75 + 18t + -18t + 0.45t2 + -0.45t2

Combine like terms: -75 + 75 = 0
75 + -18t + -0.45t2 = 0 + 18t + -18t + 0.45t2 + -0.45t2
75 + -18t + -0.45t2 = 18t + -18t + 0.45t2 + -0.45t2

Combine like terms: 18t + -18t = 0
75 + -18t + -0.45t2 = 0 + 0.45t2 + -0.45t2
75 + -18t + -0.45t2 = 0.45t2 + -0.45t2

Combine like terms: 0.45t2 + -0.45t2 = 0.00
75 + -18t + -0.45t2 = 0.00

Begin completing the square.  Divide all terms by
-0.45 the coefficient of the squared term: 

Divide each side by '-0.45'.
-166.6666667 + 40t + t2 = 0

Move the constant term to the right:

Add '166.6666667' to each side of the equation.
-166.6666667 + 40t + 166.6666667 + t2 = 0 + 166.6666667

Reorder the terms:
-166.6666667 + 166.6666667 + 40t + t2 = 0 + 166.6666667

Combine like terms: -166.6666667 + 166.6666667 = 0.0000000
0.0000000 + 40t + t2 = 0 + 166.6666667
40t + t2 = 0 + 166.6666667

Combine like terms: 0 + 166.6666667 = 166.6666667
40t + t2 = 166.6666667

The t term is 40t.  Take half its coefficient (20).
Square it (400) and add it to both sides.

Add '400' to each side of the equation.
40t + 400 + t2 = 166.6666667 + 400

Reorder the terms:
400 + 40t + t2 = 166.6666667 + 400

Combine like terms: 166.6666667 + 400 = 566.6666667
400 + 40t + t2 = 566.6666667

Factor a perfect square on the left side:
(t + 20)(t + 20) = 566.6666667

Calculate the square root of the right side: 23.804761429

Break this problem into two subproblems by setting 
(t + 20) equal to 23.804761429 and -23.804761429.

Subproblem 1

t + 20 = 23.804761429 Simplifying t + 20 = 23.804761429 Reorder the terms: 20 + t = 23.804761429 Solving 20 + t = 23.804761429 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + t = 23.804761429 + -20 Combine like terms: 20 + -20 = 0 0 + t = 23.804761429 + -20 t = 23.804761429 + -20 Combine like terms: 23.804761429 + -20 = 3.804761429 t = 3.804761429 Simplifying t = 3.804761429

Subproblem 2

t + 20 = -23.804761429 Simplifying t + 20 = -23.804761429 Reorder the terms: 20 + t = -23.804761429 Solving 20 + t = -23.804761429 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + t = -23.804761429 + -20 Combine like terms: 20 + -20 = 0 0 + t = -23.804761429 + -20 t = -23.804761429 + -20 Combine like terms: -23.804761429 + -20 = -43.804761429 t = -43.804761429 Simplifying t = -43.804761429

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.804761429, -43.804761429}

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