t^2+40t+80=0

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Solution for t^2+40t+80=0 equation:


Simplifying
t2 + 40t + 80 = 0

Reorder the terms:
80 + 40t + t2 = 0

Solving
80 + 40t + t2 = 0

Solving for variable 't'.

Begin completing the square.

Move the constant term to the right:

Add '-80' to each side of the equation.
80 + 40t + -80 + t2 = 0 + -80

Reorder the terms:
80 + -80 + 40t + t2 = 0 + -80

Combine like terms: 80 + -80 = 0
0 + 40t + t2 = 0 + -80
40t + t2 = 0 + -80

Combine like terms: 0 + -80 = -80
40t + t2 = -80

The t term is 40t.  Take half its coefficient (20).
Square it (400) and add it to both sides.

Add '400' to each side of the equation.
40t + 400 + t2 = -80 + 400

Reorder the terms:
400 + 40t + t2 = -80 + 400

Combine like terms: -80 + 400 = 320
400 + 40t + t2 = 320

Factor a perfect square on the left side:
(t + 20)(t + 20) = 320

Calculate the square root of the right side: 17.88854382

Break this problem into two subproblems by setting 
(t + 20) equal to 17.88854382 and -17.88854382.

Subproblem 1

t + 20 = 17.88854382 Simplifying t + 20 = 17.88854382 Reorder the terms: 20 + t = 17.88854382 Solving 20 + t = 17.88854382 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + t = 17.88854382 + -20 Combine like terms: 20 + -20 = 0 0 + t = 17.88854382 + -20 t = 17.88854382 + -20 Combine like terms: 17.88854382 + -20 = -2.11145618 t = -2.11145618 Simplifying t = -2.11145618

Subproblem 2

t + 20 = -17.88854382 Simplifying t + 20 = -17.88854382 Reorder the terms: 20 + t = -17.88854382 Solving 20 + t = -17.88854382 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + t = -17.88854382 + -20 Combine like terms: 20 + -20 = 0 0 + t = -17.88854382 + -20 t = -17.88854382 + -20 Combine like terms: -17.88854382 + -20 = -37.88854382 t = -37.88854382 Simplifying t = -37.88854382

Solution

The solution to the problem is based on the solutions from the subproblems. t = {-2.11145618, -37.88854382}

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