-5t^2-4t+43=0

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Solution for -5t^2-4t+43=0 equation:


Simplifying
-5t2 + -4t + 43 = 0

Reorder the terms:
43 + -4t + -5t2 = 0

Solving
43 + -4t + -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 + 0.8t + t2 = 0

Move the constant term to the right:

Add '8.6' to each side of the equation.
-8.6 + 0.8t + 8.6 + t2 = 0 + 8.6

Reorder the terms:
-8.6 + 8.6 + 0.8t + t2 = 0 + 8.6

Combine like terms: -8.6 + 8.6 = 0.0
0.0 + 0.8t + t2 = 0 + 8.6
0.8t + t2 = 0 + 8.6

Combine like terms: 0 + 8.6 = 8.6
0.8t + t2 = 8.6

The t term is 0.8t.  Take half its coefficient (0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
0.8t + 0.16 + t2 = 8.6 + 0.16

Reorder the terms:
0.16 + 0.8t + t2 = 8.6 + 0.16

Combine like terms: 8.6 + 0.16 = 8.76
0.16 + 0.8t + t2 = 8.76

Factor a perfect square on the left side:
(t + 0.4)(t + 0.4) = 8.76

Calculate the square root of the right side: 2.959729717

Break this problem into two subproblems by setting 
(t + 0.4) equal to 2.959729717 and -2.959729717.

Subproblem 1

t + 0.4 = 2.959729717 Simplifying t + 0.4 = 2.959729717 Reorder the terms: 0.4 + t = 2.959729717 Solving 0.4 + t = 2.959729717 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + t = 2.959729717 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + t = 2.959729717 + -0.4 t = 2.959729717 + -0.4 Combine like terms: 2.959729717 + -0.4 = 2.559729717 t = 2.559729717 Simplifying t = 2.559729717

Subproblem 2

t + 0.4 = -2.959729717 Simplifying t + 0.4 = -2.959729717 Reorder the terms: 0.4 + t = -2.959729717 Solving 0.4 + t = -2.959729717 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + t = -2.959729717 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + t = -2.959729717 + -0.4 t = -2.959729717 + -0.4 Combine like terms: -2.959729717 + -0.4 = -3.359729717 t = -3.359729717 Simplifying t = -3.359729717

Solution

The solution to the problem is based on the solutions from the subproblems. t = {2.559729717, -3.359729717}

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