0=5t^2+2t-43

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Solution for 0=5t^2+2t-43 equation:


Simplifying
0 = 5t2 + 2t + -43

Reorder the terms:
0 = -43 + 2t + 5t2

Solving
0 = -43 + 2t + 5t2

Solving for variable 't'.

Combine like terms: 0 + 43 = 43
43 + -2t + -5t2 = -43 + 2t + 5t2 + 43 + -2t + -5t2

Reorder the terms:
43 + -2t + -5t2 = -43 + 43 + 2t + -2t + 5t2 + -5t2

Combine like terms: -43 + 43 = 0
43 + -2t + -5t2 = 0 + 2t + -2t + 5t2 + -5t2
43 + -2t + -5t2 = 2t + -2t + 5t2 + -5t2

Combine like terms: 2t + -2t = 0
43 + -2t + -5t2 = 0 + 5t2 + -5t2
43 + -2t + -5t2 = 5t2 + -5t2

Combine like terms: 5t2 + -5t2 = 0
43 + -2t + -5t2 = 0

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

Divide each side by '-5'.
-8.6 + 0.4t + t2 = 0

Move the constant term to the right:

Add '8.6' to each side of the equation.
-8.6 + 0.4t + 8.6 + t2 = 0 + 8.6

Reorder the terms:
-8.6 + 8.6 + 0.4t + t2 = 0 + 8.6

Combine like terms: -8.6 + 8.6 = 0.0
0.0 + 0.4t + t2 = 0 + 8.6
0.4t + t2 = 0 + 8.6

Combine like terms: 0 + 8.6 = 8.6
0.4t + t2 = 8.6

The t term is 0.4t.  Take half its coefficient (0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
0.4t + 0.04 + t2 = 8.6 + 0.04

Reorder the terms:
0.04 + 0.4t + t2 = 8.6 + 0.04

Combine like terms: 8.6 + 0.04 = 8.64
0.04 + 0.4t + t2 = 8.64

Factor a perfect square on the left side:
(t + 0.2)(t + 0.2) = 8.64

Calculate the square root of the right side: 2.939387691

Break this problem into two subproblems by setting 
(t + 0.2) equal to 2.939387691 and -2.939387691.

Subproblem 1

t + 0.2 = 2.939387691 Simplifying t + 0.2 = 2.939387691 Reorder the terms: 0.2 + t = 2.939387691 Solving 0.2 + t = 2.939387691 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + t = 2.939387691 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + t = 2.939387691 + -0.2 t = 2.939387691 + -0.2 Combine like terms: 2.939387691 + -0.2 = 2.739387691 t = 2.739387691 Simplifying t = 2.739387691

Subproblem 2

t + 0.2 = -2.939387691 Simplifying t + 0.2 = -2.939387691 Reorder the terms: 0.2 + t = -2.939387691 Solving 0.2 + t = -2.939387691 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + t = -2.939387691 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + t = -2.939387691 + -0.2 t = -2.939387691 + -0.2 Combine like terms: -2.939387691 + -0.2 = -3.139387691 t = -3.139387691 Simplifying t = -3.139387691

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.739387691, -3.139387691}

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