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

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


Simplifying
5t(7 + -1t) + -4(2t + 5) = 0
(7 * 5t + -1t * 5t) + -4(2t + 5) = 0
(35t + -5t2) + -4(2t + 5) = 0

Reorder the terms:
35t + -5t2 + -4(5 + 2t) = 0
35t + -5t2 + (5 * -4 + 2t * -4) = 0
35t + -5t2 + (-20 + -8t) = 0

Reorder the terms:
-20 + 35t + -8t + -5t2 = 0

Combine like terms: 35t + -8t = 27t
-20 + 27t + -5t2 = 0

Solving
-20 + 27t + -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'.
4 + -5.4t + t2 = 0

Move the constant term to the right:

Add '-4' to each side of the equation.
4 + -5.4t + -4 + t2 = 0 + -4

Reorder the terms:
4 + -4 + -5.4t + t2 = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -5.4t + t2 = 0 + -4
-5.4t + t2 = 0 + -4

Combine like terms: 0 + -4 = -4
-5.4t + t2 = -4

The t term is -5.4t.  Take half its coefficient (-2.7).
Square it (7.29) and add it to both sides.

Add '7.29' to each side of the equation.
-5.4t + 7.29 + t2 = -4 + 7.29

Reorder the terms:
7.29 + -5.4t + t2 = -4 + 7.29

Combine like terms: -4 + 7.29 = 3.29
7.29 + -5.4t + t2 = 3.29

Factor a perfect square on the left side:
(t + -2.7)(t + -2.7) = 3.29

Calculate the square root of the right side: 1.813835715

Break this problem into two subproblems by setting 
(t + -2.7) equal to 1.813835715 and -1.813835715.

Subproblem 1

t + -2.7 = 1.813835715 Simplifying t + -2.7 = 1.813835715 Reorder the terms: -2.7 + t = 1.813835715 Solving -2.7 + t = 1.813835715 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.7' to each side of the equation. -2.7 + 2.7 + t = 1.813835715 + 2.7 Combine like terms: -2.7 + 2.7 = 0.0 0.0 + t = 1.813835715 + 2.7 t = 1.813835715 + 2.7 Combine like terms: 1.813835715 + 2.7 = 4.513835715 t = 4.513835715 Simplifying t = 4.513835715

Subproblem 2

t + -2.7 = -1.813835715 Simplifying t + -2.7 = -1.813835715 Reorder the terms: -2.7 + t = -1.813835715 Solving -2.7 + t = -1.813835715 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '2.7' to each side of the equation. -2.7 + 2.7 + t = -1.813835715 + 2.7 Combine like terms: -2.7 + 2.7 = 0.0 0.0 + t = -1.813835715 + 2.7 t = -1.813835715 + 2.7 Combine like terms: -1.813835715 + 2.7 = 0.886164285 t = 0.886164285 Simplifying t = 0.886164285

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.513835715, 0.886164285}

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