3=-5t^2+45t+4

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Solution for 3=-5t^2+45t+4 equation:


Simplifying
3 = -5t2 + 45t + 4

Reorder the terms:
3 = 4 + 45t + -5t2

Solving
3 = 4 + 45t + -5t2

Solving for variable 't'.

Combine like terms: 3 + -4 = -1
-1 + -45t + 5t2 = 4 + 45t + -5t2 + -4 + -45t + 5t2

Reorder the terms:
-1 + -45t + 5t2 = 4 + -4 + 45t + -45t + -5t2 + 5t2

Combine like terms: 4 + -4 = 0
-1 + -45t + 5t2 = 0 + 45t + -45t + -5t2 + 5t2
-1 + -45t + 5t2 = 45t + -45t + -5t2 + 5t2

Combine like terms: 45t + -45t = 0
-1 + -45t + 5t2 = 0 + -5t2 + 5t2
-1 + -45t + 5t2 = -5t2 + 5t2

Combine like terms: -5t2 + 5t2 = 0
-1 + -45t + 5t2 = 0

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

Divide each side by '5'.
-0.2 + -9t + t2 = 0

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + -9t + 0.2 + t2 = 0 + 0.2

Reorder the terms:
-0.2 + 0.2 + -9t + t2 = 0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + -9t + t2 = 0 + 0.2
-9t + t2 = 0 + 0.2

Combine like terms: 0 + 0.2 = 0.2
-9t + t2 = 0.2

The t term is -9t.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9t + 20.25 + t2 = 0.2 + 20.25

Reorder the terms:
20.25 + -9t + t2 = 0.2 + 20.25

Combine like terms: 0.2 + 20.25 = 20.45
20.25 + -9t + t2 = 20.45

Factor a perfect square on the left side:
(t + -4.5)(t + -4.5) = 20.45

Calculate the square root of the right side: 4.522167622

Break this problem into two subproblems by setting 
(t + -4.5) equal to 4.522167622 and -4.522167622.

Subproblem 1

t + -4.5 = 4.522167622 Simplifying t + -4.5 = 4.522167622 Reorder the terms: -4.5 + t = 4.522167622 Solving -4.5 + t = 4.522167622 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + t = 4.522167622 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + t = 4.522167622 + 4.5 t = 4.522167622 + 4.5 Combine like terms: 4.522167622 + 4.5 = 9.022167622 t = 9.022167622 Simplifying t = 9.022167622

Subproblem 2

t + -4.5 = -4.522167622 Simplifying t + -4.5 = -4.522167622 Reorder the terms: -4.5 + t = -4.522167622 Solving -4.5 + t = -4.522167622 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + t = -4.522167622 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + t = -4.522167622 + 4.5 t = -4.522167622 + 4.5 Combine like terms: -4.522167622 + 4.5 = -0.022167622 t = -0.022167622 Simplifying t = -0.022167622

Solution

The solution to the problem is based on the solutions from the subproblems. t = {9.022167622, -0.022167622}

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