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

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


Simplifying
0 = -5t2 + 40t + 2

Reorder the terms:
0 = 2 + 40t + -5t2

Solving
0 = 2 + 40t + -5t2

Solving for variable 't'.

Combine like terms: 0 + -2 = -2
-2 + -40t + 5t2 = 2 + 40t + -5t2 + -2 + -40t + 5t2

Reorder the terms:
-2 + -40t + 5t2 = 2 + -2 + 40t + -40t + -5t2 + 5t2

Combine like terms: 2 + -2 = 0
-2 + -40t + 5t2 = 0 + 40t + -40t + -5t2 + 5t2
-2 + -40t + 5t2 = 40t + -40t + -5t2 + 5t2

Combine like terms: 40t + -40t = 0
-2 + -40t + 5t2 = 0 + -5t2 + 5t2
-2 + -40t + 5t2 = -5t2 + 5t2

Combine like terms: -5t2 + 5t2 = 0
-2 + -40t + 5t2 = 0

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

Divide each side by '5'.
-0.4 + -8t + t2 = 0

Move the constant term to the right:

Add '0.4' to each side of the equation.
-0.4 + -8t + 0.4 + t2 = 0 + 0.4

Reorder the terms:
-0.4 + 0.4 + -8t + t2 = 0 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + -8t + t2 = 0 + 0.4
-8t + t2 = 0 + 0.4

Combine like terms: 0 + 0.4 = 0.4
-8t + t2 = 0.4

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 = 0.4 + 16

Reorder the terms:
16 + -8t + t2 = 0.4 + 16

Combine like terms: 0.4 + 16 = 16.4
16 + -8t + t2 = 16.4

Factor a perfect square on the left side:
(t + -4)(t + -4) = 16.4

Calculate the square root of the right side: 4.049691346

Break this problem into two subproblems by setting 
(t + -4) equal to 4.049691346 and -4.049691346.

Subproblem 1

t + -4 = 4.049691346 Simplifying t + -4 = 4.049691346 Reorder the terms: -4 + t = 4.049691346 Solving -4 + t = 4.049691346 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 = 4.049691346 + 4 Combine like terms: -4 + 4 = 0 0 + t = 4.049691346 + 4 t = 4.049691346 + 4 Combine like terms: 4.049691346 + 4 = 8.049691346 t = 8.049691346 Simplifying t = 8.049691346

Subproblem 2

t + -4 = -4.049691346 Simplifying t + -4 = -4.049691346 Reorder the terms: -4 + t = -4.049691346 Solving -4 + t = -4.049691346 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 = -4.049691346 + 4 Combine like terms: -4 + 4 = 0 0 + t = -4.049691346 + 4 t = -4.049691346 + 4 Combine like terms: -4.049691346 + 4 = -0.049691346 t = -0.049691346 Simplifying t = -0.049691346

Solution

The solution to the problem is based on the solutions from the subproblems. t = {8.049691346, -0.049691346}

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