-5t^2+40t+3=0

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Solution for -5t^2+40t+3=0 equation:


Simplifying
-5t2 + 40t + 3 = 0

Reorder the terms:
3 + 40t + -5t2 = 0

Solving
3 + 40t + -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'.
-0.6 + -8t + t2 = 0

Move the constant term to the right:

Add '0.6' to each side of the equation.
-0.6 + -8t + 0.6 + t2 = 0 + 0.6

Reorder the terms:
-0.6 + 0.6 + -8t + t2 = 0 + 0.6

Combine like terms: -0.6 + 0.6 = 0.0
0.0 + -8t + t2 = 0 + 0.6
-8t + t2 = 0 + 0.6

Combine like terms: 0 + 0.6 = 0.6
-8t + t2 = 0.6

The t term is -8t.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8t + 16 + t2 = 0.6 + 16

Reorder the terms:
16 + -8t + t2 = 0.6 + 16

Combine like terms: 0.6 + 16 = 16.6
16 + -8t + t2 = 16.6

Factor a perfect square on the left side:
(t + -4)(t + -4) = 16.6

Calculate the square root of the right side: 4.074309757

Break this problem into two subproblems by setting 
(t + -4) equal to 4.074309757 and -4.074309757.

Subproblem 1

t + -4 = 4.074309757 Simplifying t + -4 = 4.074309757 Reorder the terms: -4 + t = 4.074309757 Solving -4 + t = 4.074309757 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + t = 4.074309757 + 4 Combine like terms: -4 + 4 = 0 0 + t = 4.074309757 + 4 t = 4.074309757 + 4 Combine like terms: 4.074309757 + 4 = 8.074309757 t = 8.074309757 Simplifying t = 8.074309757

Subproblem 2

t + -4 = -4.074309757 Simplifying t + -4 = -4.074309757 Reorder the terms: -4 + t = -4.074309757 Solving -4 + t = -4.074309757 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + t = -4.074309757 + 4 Combine like terms: -4 + 4 = 0 0 + t = -4.074309757 + 4 t = -4.074309757 + 4 Combine like terms: -4.074309757 + 4 = -0.074309757 t = -0.074309757 Simplifying t = -0.074309757

Solution

The solution to the problem is based on the solutions from the subproblems. t = {8.074309757, -0.074309757}

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