0=t^2+17t-30

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Solution for 0=t^2+17t-30 equation:


Simplifying
0 = t2 + 17t + -30

Reorder the terms:
0 = -30 + 17t + t2

Solving
0 = -30 + 17t + t2

Solving for variable 't'.

Combine like terms: 0 + 30 = 30
30 + -17t + -1t2 = -30 + 17t + t2 + 30 + -17t + -1t2

Reorder the terms:
30 + -17t + -1t2 = -30 + 30 + 17t + -17t + t2 + -1t2

Combine like terms: -30 + 30 = 0
30 + -17t + -1t2 = 0 + 17t + -17t + t2 + -1t2
30 + -17t + -1t2 = 17t + -17t + t2 + -1t2

Combine like terms: 17t + -17t = 0
30 + -17t + -1t2 = 0 + t2 + -1t2
30 + -17t + -1t2 = t2 + -1t2

Combine like terms: t2 + -1t2 = 0
30 + -17t + -1t2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-30 + 17t + t2 = 0

Move the constant term to the right:

Add '30' to each side of the equation.
-30 + 17t + 30 + t2 = 0 + 30

Reorder the terms:
-30 + 30 + 17t + t2 = 0 + 30

Combine like terms: -30 + 30 = 0
0 + 17t + t2 = 0 + 30
17t + t2 = 0 + 30

Combine like terms: 0 + 30 = 30
17t + t2 = 30

The t term is 17t.  Take half its coefficient (8.5).
Square it (72.25) and add it to both sides.

Add '72.25' to each side of the equation.
17t + 72.25 + t2 = 30 + 72.25

Reorder the terms:
72.25 + 17t + t2 = 30 + 72.25

Combine like terms: 30 + 72.25 = 102.25
72.25 + 17t + t2 = 102.25

Factor a perfect square on the left side:
(t + 8.5)(t + 8.5) = 102.25

Calculate the square root of the right side: 10.111874208

Break this problem into two subproblems by setting 
(t + 8.5) equal to 10.111874208 and -10.111874208.

Subproblem 1

t + 8.5 = 10.111874208 Simplifying t + 8.5 = 10.111874208 Reorder the terms: 8.5 + t = 10.111874208 Solving 8.5 + t = 10.111874208 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-8.5' to each side of the equation. 8.5 + -8.5 + t = 10.111874208 + -8.5 Combine like terms: 8.5 + -8.5 = 0.0 0.0 + t = 10.111874208 + -8.5 t = 10.111874208 + -8.5 Combine like terms: 10.111874208 + -8.5 = 1.611874208 t = 1.611874208 Simplifying t = 1.611874208

Subproblem 2

t + 8.5 = -10.111874208 Simplifying t + 8.5 = -10.111874208 Reorder the terms: 8.5 + t = -10.111874208 Solving 8.5 + t = -10.111874208 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '-8.5' to each side of the equation. 8.5 + -8.5 + t = -10.111874208 + -8.5 Combine like terms: 8.5 + -8.5 = 0.0 0.0 + t = -10.111874208 + -8.5 t = -10.111874208 + -8.5 Combine like terms: -10.111874208 + -8.5 = -18.611874208 t = -18.611874208 Simplifying t = -18.611874208

Solution

The solution to the problem is based on the solutions from the subproblems. t = {1.611874208, -18.611874208}

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