-5(t-4)t=7+1

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Solution for -5(t-4)t=7+1 equation:


Simplifying
-5(t + -4) * t = 7 + 1

Reorder the terms:
-5(-4 + t) * t = 7 + 1

Reorder the terms for easier multiplication:
-5t(-4 + t) = 7 + 1
(-4 * -5t + t * -5t) = 7 + 1
(20t + -5t2) = 7 + 1

Combine like terms: 7 + 1 = 8
20t + -5t2 = 8

Solving
20t + -5t2 = 8

Solving for variable 't'.

Reorder the terms:
-8 + 20t + -5t2 = 8 + -8

Combine like terms: 8 + -8 = 0
-8 + 20t + -5t2 = 0

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

Divide each side by '-5'.
1.6 + -4t + t2 = 0

Move the constant term to the right:

Add '-1.6' to each side of the equation.
1.6 + -4t + -1.6 + t2 = 0 + -1.6

Reorder the terms:
1.6 + -1.6 + -4t + t2 = 0 + -1.6

Combine like terms: 1.6 + -1.6 = 0.0
0.0 + -4t + t2 = 0 + -1.6
-4t + t2 = 0 + -1.6

Combine like terms: 0 + -1.6 = -1.6
-4t + t2 = -1.6

The t term is -4t.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4t + 4 + t2 = -1.6 + 4

Reorder the terms:
4 + -4t + t2 = -1.6 + 4

Combine like terms: -1.6 + 4 = 2.4
4 + -4t + t2 = 2.4

Factor a perfect square on the left side:
(t + -2)(t + -2) = 2.4

Calculate the square root of the right side: 1.549193338

Break this problem into two subproblems by setting 
(t + -2) equal to 1.549193338 and -1.549193338.

Subproblem 1

t + -2 = 1.549193338 Simplifying t + -2 = 1.549193338 Reorder the terms: -2 + t = 1.549193338 Solving -2 + t = 1.549193338 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + t = 1.549193338 + 2 Combine like terms: -2 + 2 = 0 0 + t = 1.549193338 + 2 t = 1.549193338 + 2 Combine like terms: 1.549193338 + 2 = 3.549193338 t = 3.549193338 Simplifying t = 3.549193338

Subproblem 2

t + -2 = -1.549193338 Simplifying t + -2 = -1.549193338 Reorder the terms: -2 + t = -1.549193338 Solving -2 + t = -1.549193338 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + t = -1.549193338 + 2 Combine like terms: -2 + 2 = 0 0 + t = -1.549193338 + 2 t = -1.549193338 + 2 Combine like terms: -1.549193338 + 2 = 0.450806662 t = 0.450806662 Simplifying t = 0.450806662

Solution

The solution to the problem is based on the solutions from the subproblems. t = {3.549193338, 0.450806662}

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