0=(-t^2)+7t+160

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Solution for 0=(-t^2)+7t+160 equation:


Simplifying
0 = (-1t2) + 7t + 160

Reorder the terms:
0 = 160 + 7t + (-1t2)

Solving
0 = 160 + 7t + (-1t2)

Solving for variable 't'.
0 + -160 + -7t + t2 = 160 + 7t + (-1t2) + -160 + -7t + (t2)

Combine like terms: 0 + -160 = -160
-160 + -7t + t2 = 160 + 7t + (-1t2) + -160 + -7t + (t2)
-160 + -7t + t2 = 160 + 7t + (-1t2) + -160 + -7t + t2

Reorder the terms:
-160 + -7t + t2 = 160 + -160 + 7t + -7t + (-1t2) + t2

Combine like terms: 160 + -160 = 0
-160 + -7t + t2 = 0 + 7t + -7t + (-1t2) + t2
-160 + -7t + t2 = 7t + -7t + (-1t2) + t2

Combine like terms: 7t + -7t = 0
-160 + -7t + t2 = 0 + (-1t2) + t2
-160 + -7t + t2 = (-1t2) + t2

Combine like terms: (-1t2) + t2 = 0
-160 + -7t + t2 = 0

Begin completing the square.

Move the constant term to the right:

Add '160' to each side of the equation.
-160 + -7t + 160 + t2 = 0 + 160

Reorder the terms:
-160 + 160 + -7t + t2 = 0 + 160

Combine like terms: -160 + 160 = 0
0 + -7t + t2 = 0 + 160
-7t + t2 = 0 + 160

Combine like terms: 0 + 160 = 160
-7t + t2 = 160

The t term is -7t.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7t + 12.25 + t2 = 160 + 12.25

Reorder the terms:
12.25 + -7t + t2 = 160 + 12.25

Combine like terms: 160 + 12.25 = 172.25
12.25 + -7t + t2 = 172.25

Factor a perfect square on the left side:
(t + -3.5)(t + -3.5) = 172.25

Calculate the square root of the right side: 13.124404748

Break this problem into two subproblems by setting 
(t + -3.5) equal to 13.124404748 and -13.124404748.

Subproblem 1

t + -3.5 = 13.124404748 Simplifying t + -3.5 = 13.124404748 Reorder the terms: -3.5 + t = 13.124404748 Solving -3.5 + t = 13.124404748 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + t = 13.124404748 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + t = 13.124404748 + 3.5 t = 13.124404748 + 3.5 Combine like terms: 13.124404748 + 3.5 = 16.624404748 t = 16.624404748 Simplifying t = 16.624404748

Subproblem 2

t + -3.5 = -13.124404748 Simplifying t + -3.5 = -13.124404748 Reorder the terms: -3.5 + t = -13.124404748 Solving -3.5 + t = -13.124404748 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + t = -13.124404748 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + t = -13.124404748 + 3.5 t = -13.124404748 + 3.5 Combine like terms: -13.124404748 + 3.5 = -9.624404748 t = -9.624404748 Simplifying t = -9.624404748

Solution

The solution to the problem is based on the solutions from the subproblems. t = {16.624404748, -9.624404748}

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