5t^2-80t-8=0

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Solution for 5t^2-80t-8=0 equation:


Simplifying
5t2 + -80t + -8 = 0

Reorder the terms:
-8 + -80t + 5t2 = 0

Solving
-8 + -80t + 5t2 = 0

Solving for variable 't'.

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

Divide each side by '5'.
-1.6 + -16t + t2 = 0

Move the constant term to the right:

Add '1.6' to each side of the equation.
-1.6 + -16t + 1.6 + t2 = 0 + 1.6

Reorder the terms:
-1.6 + 1.6 + -16t + t2 = 0 + 1.6

Combine like terms: -1.6 + 1.6 = 0.0
0.0 + -16t + t2 = 0 + 1.6
-16t + t2 = 0 + 1.6

Combine like terms: 0 + 1.6 = 1.6
-16t + t2 = 1.6

The t term is -16t.  Take half its coefficient (-8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
-16t + 64 + t2 = 1.6 + 64

Reorder the terms:
64 + -16t + t2 = 1.6 + 64

Combine like terms: 1.6 + 64 = 65.6
64 + -16t + t2 = 65.6

Factor a perfect square on the left side:
(t + -8)(t + -8) = 65.6

Calculate the square root of the right side: 8.099382693

Break this problem into two subproblems by setting 
(t + -8) equal to 8.099382693 and -8.099382693.

Subproblem 1

t + -8 = 8.099382693 Simplifying t + -8 = 8.099382693 Reorder the terms: -8 + t = 8.099382693 Solving -8 + t = 8.099382693 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + t = 8.099382693 + 8 Combine like terms: -8 + 8 = 0 0 + t = 8.099382693 + 8 t = 8.099382693 + 8 Combine like terms: 8.099382693 + 8 = 16.099382693 t = 16.099382693 Simplifying t = 16.099382693

Subproblem 2

t + -8 = -8.099382693 Simplifying t + -8 = -8.099382693 Reorder the terms: -8 + t = -8.099382693 Solving -8 + t = -8.099382693 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + t = -8.099382693 + 8 Combine like terms: -8 + 8 = 0 0 + t = -8.099382693 + 8 t = -8.099382693 + 8 Combine like terms: -8.099382693 + 8 = -0.099382693 t = -0.099382693 Simplifying t = -0.099382693

Solution

The solution to the problem is based on the solutions from the subproblems. t = {16.099382693, -0.099382693}

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