5t^2+33t-40=0

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Solution for 5t^2+33t-40=0 equation:


Simplifying
5t2 + 33t + -40 = 0

Reorder the terms:
-40 + 33t + 5t2 = 0

Solving
-40 + 33t + 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'.
-8 + 6.6t + t2 = 0

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + 6.6t + 8 + t2 = 0 + 8

Reorder the terms:
-8 + 8 + 6.6t + t2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + 6.6t + t2 = 0 + 8
6.6t + t2 = 0 + 8

Combine like terms: 0 + 8 = 8
6.6t + t2 = 8

The t term is 6.6t.  Take half its coefficient (3.3).
Square it (10.89) and add it to both sides.

Add '10.89' to each side of the equation.
6.6t + 10.89 + t2 = 8 + 10.89

Reorder the terms:
10.89 + 6.6t + t2 = 8 + 10.89

Combine like terms: 8 + 10.89 = 18.89
10.89 + 6.6t + t2 = 18.89

Factor a perfect square on the left side:
(t + 3.3)(t + 3.3) = 18.89

Calculate the square root of the right side: 4.346262762

Break this problem into two subproblems by setting 
(t + 3.3) equal to 4.346262762 and -4.346262762.

Subproblem 1

t + 3.3 = 4.346262762 Simplifying t + 3.3 = 4.346262762 Reorder the terms: 3.3 + t = 4.346262762 Solving 3.3 + t = 4.346262762 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-3.3' to each side of the equation. 3.3 + -3.3 + t = 4.346262762 + -3.3 Combine like terms: 3.3 + -3.3 = 0.0 0.0 + t = 4.346262762 + -3.3 t = 4.346262762 + -3.3 Combine like terms: 4.346262762 + -3.3 = 1.046262762 t = 1.046262762 Simplifying t = 1.046262762

Subproblem 2

t + 3.3 = -4.346262762 Simplifying t + 3.3 = -4.346262762 Reorder the terms: 3.3 + t = -4.346262762 Solving 3.3 + t = -4.346262762 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-3.3' to each side of the equation. 3.3 + -3.3 + t = -4.346262762 + -3.3 Combine like terms: 3.3 + -3.3 = 0.0 0.0 + t = -4.346262762 + -3.3 t = -4.346262762 + -3.3 Combine like terms: -4.346262762 + -3.3 = -7.646262762 t = -7.646262762 Simplifying t = -7.646262762

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.046262762, -7.646262762}

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