-t^2+30t-100=0

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Solution for -t^2+30t-100=0 equation:


Simplifying
-1t2 + 30t + -100 = 0

Reorder the terms:
-100 + 30t + -1t2 = 0

Solving
-100 + 30t + -1t2 = 0

Solving for variable 't'.

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

Divide each side by '-1'.
100 + -30t + t2 = 0

Move the constant term to the right:

Add '-100' to each side of the equation.
100 + -30t + -100 + t2 = 0 + -100

Reorder the terms:
100 + -100 + -30t + t2 = 0 + -100

Combine like terms: 100 + -100 = 0
0 + -30t + t2 = 0 + -100
-30t + t2 = 0 + -100

Combine like terms: 0 + -100 = -100
-30t + t2 = -100

The t term is -30t.  Take half its coefficient (-15).
Square it (225) and add it to both sides.

Add '225' to each side of the equation.
-30t + 225 + t2 = -100 + 225

Reorder the terms:
225 + -30t + t2 = -100 + 225

Combine like terms: -100 + 225 = 125
225 + -30t + t2 = 125

Factor a perfect square on the left side:
(t + -15)(t + -15) = 125

Calculate the square root of the right side: 11.180339887

Break this problem into two subproblems by setting 
(t + -15) equal to 11.180339887 and -11.180339887.

Subproblem 1

t + -15 = 11.180339887 Simplifying t + -15 = 11.180339887 Reorder the terms: -15 + t = 11.180339887 Solving -15 + t = 11.180339887 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + t = 11.180339887 + 15 Combine like terms: -15 + 15 = 0 0 + t = 11.180339887 + 15 t = 11.180339887 + 15 Combine like terms: 11.180339887 + 15 = 26.180339887 t = 26.180339887 Simplifying t = 26.180339887

Subproblem 2

t + -15 = -11.180339887 Simplifying t + -15 = -11.180339887 Reorder the terms: -15 + t = -11.180339887 Solving -15 + t = -11.180339887 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + t = -11.180339887 + 15 Combine like terms: -15 + 15 = 0 0 + t = -11.180339887 + 15 t = -11.180339887 + 15 Combine like terms: -11.180339887 + 15 = 3.819660113 t = 3.819660113 Simplifying t = 3.819660113

Solution

The solution to the problem is based on the solutions from the subproblems. t = {26.180339887, 3.819660113}

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