(6-t)+(7-t)(-4-t)=0

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Solution for (6-t)+(7-t)(-4-t)=0 equation:


Simplifying
(6 + -1t) + (7 + -1t)(-4 + -1t) = 0

Remove parenthesis around (6 + -1t)
6 + -1t + (7 + -1t)(-4 + -1t) = 0

Multiply (7 + -1t) * (-4 + -1t)
6 + -1t + (7(-4 + -1t) + -1t * (-4 + -1t)) = 0
6 + -1t + ((-4 * 7 + -1t * 7) + -1t * (-4 + -1t)) = 0
6 + -1t + ((-28 + -7t) + -1t * (-4 + -1t)) = 0
6 + -1t + (-28 + -7t + (-4 * -1t + -1t * -1t)) = 0
6 + -1t + (-28 + -7t + (4t + 1t2)) = 0

Combine like terms: -7t + 4t = -3t
6 + -1t + (-28 + -3t + 1t2) = 0

Reorder the terms:
6 + -28 + -1t + -3t + 1t2 = 0

Combine like terms: 6 + -28 = -22
-22 + -1t + -3t + 1t2 = 0

Combine like terms: -1t + -3t = -4t
-22 + -4t + 1t2 = 0

Solving
-22 + -4t + 1t2 = 0

Solving for variable 't'.

Begin completing the square.

Move the constant term to the right:

Add '22' to each side of the equation.
-22 + -4t + 22 + t2 = 0 + 22

Reorder the terms:
-22 + 22 + -4t + t2 = 0 + 22

Combine like terms: -22 + 22 = 0
0 + -4t + t2 = 0 + 22
-4t + t2 = 0 + 22

Combine like terms: 0 + 22 = 22
-4t + t2 = 22

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 = 22 + 4

Reorder the terms:
4 + -4t + t2 = 22 + 4

Combine like terms: 22 + 4 = 26
4 + -4t + t2 = 26

Factor a perfect square on the left side:
(t + -2)(t + -2) = 26

Calculate the square root of the right side: 5.099019514

Break this problem into two subproblems by setting 
(t + -2) equal to 5.099019514 and -5.099019514.

Subproblem 1

t + -2 = 5.099019514 Simplifying t + -2 = 5.099019514 Reorder the terms: -2 + t = 5.099019514 Solving -2 + t = 5.099019514 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 = 5.099019514 + 2 Combine like terms: -2 + 2 = 0 0 + t = 5.099019514 + 2 t = 5.099019514 + 2 Combine like terms: 5.099019514 + 2 = 7.099019514 t = 7.099019514 Simplifying t = 7.099019514

Subproblem 2

t + -2 = -5.099019514 Simplifying t + -2 = -5.099019514 Reorder the terms: -2 + t = -5.099019514 Solving -2 + t = -5.099019514 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 = -5.099019514 + 2 Combine like terms: -2 + 2 = 0 0 + t = -5.099019514 + 2 t = -5.099019514 + 2 Combine like terms: -5.099019514 + 2 = -3.099019514 t = -3.099019514 Simplifying t = -3.099019514

Solution

The solution to the problem is based on the solutions from the subproblems. t = {7.099019514, -3.099019514}

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