5t(7-t)=4t+2(9+t)

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Solution for 5t(7-t)=4t+2(9+t) equation:


Simplifying
5t(7 + -1t) = 4t + 2(9 + t)
(7 * 5t + -1t * 5t) = 4t + 2(9 + t)
(35t + -5t2) = 4t + 2(9 + t)
35t + -5t2 = 4t + (9 * 2 + t * 2)
35t + -5t2 = 4t + (18 + 2t)

Reorder the terms:
35t + -5t2 = 18 + 4t + 2t

Combine like terms: 4t + 2t = 6t
35t + -5t2 = 18 + 6t

Solving
35t + -5t2 = 18 + 6t

Solving for variable 't'.

Reorder the terms:
-18 + 35t + -6t + -5t2 = 18 + 6t + -18 + -6t

Combine like terms: 35t + -6t = 29t
-18 + 29t + -5t2 = 18 + 6t + -18 + -6t

Reorder the terms:
-18 + 29t + -5t2 = 18 + -18 + 6t + -6t

Combine like terms: 18 + -18 = 0
-18 + 29t + -5t2 = 0 + 6t + -6t
-18 + 29t + -5t2 = 6t + -6t

Combine like terms: 6t + -6t = 0
-18 + 29t + -5t2 = 0

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

Divide each side by '-5'.
3.6 + -5.8t + t2 = 0

Move the constant term to the right:

Add '-3.6' to each side of the equation.
3.6 + -5.8t + -3.6 + t2 = 0 + -3.6

Reorder the terms:
3.6 + -3.6 + -5.8t + t2 = 0 + -3.6

Combine like terms: 3.6 + -3.6 = 0.0
0.0 + -5.8t + t2 = 0 + -3.6
-5.8t + t2 = 0 + -3.6

Combine like terms: 0 + -3.6 = -3.6
-5.8t + t2 = -3.6

The t term is -5.8t.  Take half its coefficient (-2.9).
Square it (8.41) and add it to both sides.

Add '8.41' to each side of the equation.
-5.8t + 8.41 + t2 = -3.6 + 8.41

Reorder the terms:
8.41 + -5.8t + t2 = -3.6 + 8.41

Combine like terms: -3.6 + 8.41 = 4.81
8.41 + -5.8t + t2 = 4.81

Factor a perfect square on the left side:
(t + -2.9)(t + -2.9) = 4.81

Calculate the square root of the right side: 2.19317122

Break this problem into two subproblems by setting 
(t + -2.9) equal to 2.19317122 and -2.19317122.

Subproblem 1

t + -2.9 = 2.19317122 Simplifying t + -2.9 = 2.19317122 Reorder the terms: -2.9 + t = 2.19317122 Solving -2.9 + t = 2.19317122 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.9' to each side of the equation. -2.9 + 2.9 + t = 2.19317122 + 2.9 Combine like terms: -2.9 + 2.9 = 0.0 0.0 + t = 2.19317122 + 2.9 t = 2.19317122 + 2.9 Combine like terms: 2.19317122 + 2.9 = 5.09317122 t = 5.09317122 Simplifying t = 5.09317122

Subproblem 2

t + -2.9 = -2.19317122 Simplifying t + -2.9 = -2.19317122 Reorder the terms: -2.9 + t = -2.19317122 Solving -2.9 + t = -2.19317122 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.9' to each side of the equation. -2.9 + 2.9 + t = -2.19317122 + 2.9 Combine like terms: -2.9 + 2.9 = 0.0 0.0 + t = -2.19317122 + 2.9 t = -2.19317122 + 2.9 Combine like terms: -2.19317122 + 2.9 = 0.70682878 t = 0.70682878 Simplifying t = 0.70682878

Solution

The solution to the problem is based on the solutions from the subproblems. t = {5.09317122, 0.70682878}

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