0.05t^2-3t-90=0

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Solution for 0.05t^2-3t-90=0 equation:


Simplifying
0.05t2 + -3t + -90 = 0

Reorder the terms:
-90 + -3t + 0.05t2 = 0

Solving
-90 + -3t + 0.05t2 = 0

Solving for variable 't'.

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

Divide each side by '0.05'.
-1800 + -60t + t2 = 0

Move the constant term to the right:

Add '1800' to each side of the equation.
-1800 + -60t + 1800 + t2 = 0 + 1800

Reorder the terms:
-1800 + 1800 + -60t + t2 = 0 + 1800

Combine like terms: -1800 + 1800 = 0
0 + -60t + t2 = 0 + 1800
-60t + t2 = 0 + 1800

Combine like terms: 0 + 1800 = 1800
-60t + t2 = 1800

The t term is -60t.  Take half its coefficient (-30).
Square it (900) and add it to both sides.

Add '900' to each side of the equation.
-60t + 900 + t2 = 1800 + 900

Reorder the terms:
900 + -60t + t2 = 1800 + 900

Combine like terms: 1800 + 900 = 2700
900 + -60t + t2 = 2700

Factor a perfect square on the left side:
(t + -30)(t + -30) = 2700

Calculate the square root of the right side: 51.961524227

Break this problem into two subproblems by setting 
(t + -30) equal to 51.961524227 and -51.961524227.

Subproblem 1

t + -30 = 51.961524227 Simplifying t + -30 = 51.961524227 Reorder the terms: -30 + t = 51.961524227 Solving -30 + t = 51.961524227 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + t = 51.961524227 + 30 Combine like terms: -30 + 30 = 0 0 + t = 51.961524227 + 30 t = 51.961524227 + 30 Combine like terms: 51.961524227 + 30 = 81.961524227 t = 81.961524227 Simplifying t = 81.961524227

Subproblem 2

t + -30 = -51.961524227 Simplifying t + -30 = -51.961524227 Reorder the terms: -30 + t = -51.961524227 Solving -30 + t = -51.961524227 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + t = -51.961524227 + 30 Combine like terms: -30 + 30 = 0 0 + t = -51.961524227 + 30 t = -51.961524227 + 30 Combine like terms: -51.961524227 + 30 = -21.961524227 t = -21.961524227 Simplifying t = -21.961524227

Solution

The solution to the problem is based on the solutions from the subproblems. t = {81.961524227, -21.961524227}

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