5t^2-3t-80=0

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Solution for 5t^2-3t-80=0 equation:


Simplifying
5t2 + -3t + -80 = 0

Reorder the terms:
-80 + -3t + 5t2 = 0

Solving
-80 + -3t + 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'.
-16 + -0.6t + t2 = 0

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + -0.6t + 16 + t2 = 0 + 16

Reorder the terms:
-16 + 16 + -0.6t + t2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + -0.6t + t2 = 0 + 16
-0.6t + t2 = 0 + 16

Combine like terms: 0 + 16 = 16
-0.6t + t2 = 16

The t term is -0.6t.  Take half its coefficient (-0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
-0.6t + 0.09 + t2 = 16 + 0.09

Reorder the terms:
0.09 + -0.6t + t2 = 16 + 0.09

Combine like terms: 16 + 0.09 = 16.09
0.09 + -0.6t + t2 = 16.09

Factor a perfect square on the left side:
(t + -0.3)(t + -0.3) = 16.09

Calculate the square root of the right side: 4.011234224

Break this problem into two subproblems by setting 
(t + -0.3) equal to 4.011234224 and -4.011234224.

Subproblem 1

t + -0.3 = 4.011234224 Simplifying t + -0.3 = 4.011234224 Reorder the terms: -0.3 + t = 4.011234224 Solving -0.3 + t = 4.011234224 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + t = 4.011234224 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + t = 4.011234224 + 0.3 t = 4.011234224 + 0.3 Combine like terms: 4.011234224 + 0.3 = 4.311234224 t = 4.311234224 Simplifying t = 4.311234224

Subproblem 2

t + -0.3 = -4.011234224 Simplifying t + -0.3 = -4.011234224 Reorder the terms: -0.3 + t = -4.011234224 Solving -0.3 + t = -4.011234224 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + t = -4.011234224 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + t = -4.011234224 + 0.3 t = -4.011234224 + 0.3 Combine like terms: -4.011234224 + 0.3 = -3.711234224 t = -3.711234224 Simplifying t = -3.711234224

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.311234224, -3.711234224}

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