8=-5t^2+90t

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Solution for 8=-5t^2+90t equation:


Simplifying
8 = -5t2 + 90t

Reorder the terms:
8 = 90t + -5t2

Solving
8 = 90t + -5t2

Solving for variable 't'.

Reorder the terms:
8 + -90t + 5t2 = 90t + -90t + -5t2 + 5t2

Combine like terms: 90t + -90t = 0
8 + -90t + 5t2 = 0 + -5t2 + 5t2
8 + -90t + 5t2 = -5t2 + 5t2

Combine like terms: -5t2 + 5t2 = 0
8 + -90t + 5t2 = 0

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

Divide each side by '5'.
1.6 + -18t + t2 = 0

Move the constant term to the right:

Add '-1.6' to each side of the equation.
1.6 + -18t + -1.6 + t2 = 0 + -1.6

Reorder the terms:
1.6 + -1.6 + -18t + t2 = 0 + -1.6

Combine like terms: 1.6 + -1.6 = 0.0
0.0 + -18t + t2 = 0 + -1.6
-18t + t2 = 0 + -1.6

Combine like terms: 0 + -1.6 = -1.6
-18t + t2 = -1.6

The t term is -18t.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18t + 81 + t2 = -1.6 + 81

Reorder the terms:
81 + -18t + t2 = -1.6 + 81

Combine like terms: -1.6 + 81 = 79.4
81 + -18t + t2 = 79.4

Factor a perfect square on the left side:
(t + -9)(t + -9) = 79.4

Calculate the square root of the right side: 8.910667764

Break this problem into two subproblems by setting 
(t + -9) equal to 8.910667764 and -8.910667764.

Subproblem 1

t + -9 = 8.910667764 Simplifying t + -9 = 8.910667764 Reorder the terms: -9 + t = 8.910667764 Solving -9 + t = 8.910667764 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + t = 8.910667764 + 9 Combine like terms: -9 + 9 = 0 0 + t = 8.910667764 + 9 t = 8.910667764 + 9 Combine like terms: 8.910667764 + 9 = 17.910667764 t = 17.910667764 Simplifying t = 17.910667764

Subproblem 2

t + -9 = -8.910667764 Simplifying t + -9 = -8.910667764 Reorder the terms: -9 + t = -8.910667764 Solving -9 + t = -8.910667764 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + t = -8.910667764 + 9 Combine like terms: -9 + 9 = 0 0 + t = -8.910667764 + 9 t = -8.910667764 + 9 Combine like terms: -8.910667764 + 9 = 0.089332236 t = 0.089332236 Simplifying t = 0.089332236

Solution

The solution to the problem is based on the solutions from the subproblems. t = {17.910667764, 0.089332236}

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