5(16t^2-17.8t-5)=0

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Solution for 5(16t^2-17.8t-5)=0 equation:


Simplifying
5(16t2 + -17.8t + -5) = 0

Reorder the terms:
5(-5 + -17.8t + 16t2) = 0
(-5 * 5 + -17.8t * 5 + 16t2 * 5) = 0
(-25 + -89t + 80t2) = 0

Solving
-25 + -89t + 80t2 = 0

Solving for variable 't'.

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

Divide each side by '80'.
-0.3125 + -1.1125t + t2 = 0.0

Move the constant term to the right:

Add '0.3125' to each side of the equation.
-0.3125 + -1.1125t + 0.3125 + t2 = 0.0 + 0.3125

Reorder the terms:
-0.3125 + 0.3125 + -1.1125t + t2 = 0.0 + 0.3125

Combine like terms: -0.3125 + 0.3125 = 0.0000
0.0000 + -1.1125t + t2 = 0.0 + 0.3125
-1.1125t + t2 = 0.0 + 0.3125

Combine like terms: 0.0 + 0.3125 = 0.3125
-1.1125t + t2 = 0.3125

The t term is -1.1125t.  Take half its coefficient (-0.55625).
Square it (0.3094140625) and add it to both sides.

Add '0.3094140625' to each side of the equation.
-1.1125t + 0.3094140625 + t2 = 0.3125 + 0.3094140625

Reorder the terms:
0.3094140625 + -1.1125t + t2 = 0.3125 + 0.3094140625

Combine like terms: 0.3125 + 0.3094140625 = 0.6219140625
0.3094140625 + -1.1125t + t2 = 0.6219140625

Factor a perfect square on the left side:
(t + -0.55625)(t + -0.55625) = 0.6219140625

Calculate the square root of the right side: 0.788615282

Break this problem into two subproblems by setting 
(t + -0.55625) equal to 0.788615282 and -0.788615282.

Subproblem 1

t + -0.55625 = 0.788615282 Simplifying t + -0.55625 = 0.788615282 Reorder the terms: -0.55625 + t = 0.788615282 Solving -0.55625 + t = 0.788615282 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.55625' to each side of the equation. -0.55625 + 0.55625 + t = 0.788615282 + 0.55625 Combine like terms: -0.55625 + 0.55625 = 0.00000 0.00000 + t = 0.788615282 + 0.55625 t = 0.788615282 + 0.55625 Combine like terms: 0.788615282 + 0.55625 = 1.344865282 t = 1.344865282 Simplifying t = 1.344865282

Subproblem 2

t + -0.55625 = -0.788615282 Simplifying t + -0.55625 = -0.788615282 Reorder the terms: -0.55625 + t = -0.788615282 Solving -0.55625 + t = -0.788615282 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '0.55625' to each side of the equation. -0.55625 + 0.55625 + t = -0.788615282 + 0.55625 Combine like terms: -0.55625 + 0.55625 = 0.00000 0.00000 + t = -0.788615282 + 0.55625 t = -0.788615282 + 0.55625 Combine like terms: -0.788615282 + 0.55625 = -0.232365282 t = -0.232365282 Simplifying t = -0.232365282

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.344865282, -0.232365282}

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