-30=15t-2t^2

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Solution for -30=15t-2t^2 equation:


Simplifying
-30 = 15t + -2t2

Solving
-30 = 15t + -2t2

Solving for variable 't'.

Reorder the terms:
-30 + -15t + 2t2 = 15t + -15t + -2t2 + 2t2

Combine like terms: 15t + -15t = 0
-30 + -15t + 2t2 = 0 + -2t2 + 2t2
-30 + -15t + 2t2 = -2t2 + 2t2

Combine like terms: -2t2 + 2t2 = 0
-30 + -15t + 2t2 = 0

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

Divide each side by '2'.
-15 + -7.5t + t2 = 0

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + -7.5t + 15 + t2 = 0 + 15

Reorder the terms:
-15 + 15 + -7.5t + t2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + -7.5t + t2 = 0 + 15
-7.5t + t2 = 0 + 15

Combine like terms: 0 + 15 = 15
-7.5t + t2 = 15

The t term is -7.5t.  Take half its coefficient (-3.75).
Square it (14.0625) and add it to both sides.

Add '14.0625' to each side of the equation.
-7.5t + 14.0625 + t2 = 15 + 14.0625

Reorder the terms:
14.0625 + -7.5t + t2 = 15 + 14.0625

Combine like terms: 15 + 14.0625 = 29.0625
14.0625 + -7.5t + t2 = 29.0625

Factor a perfect square on the left side:
(t + -3.75)(t + -3.75) = 29.0625

Calculate the square root of the right side: 5.390964663

Break this problem into two subproblems by setting 
(t + -3.75) equal to 5.390964663 and -5.390964663.

Subproblem 1

t + -3.75 = 5.390964663 Simplifying t + -3.75 = 5.390964663 Reorder the terms: -3.75 + t = 5.390964663 Solving -3.75 + t = 5.390964663 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3.75' to each side of the equation. -3.75 + 3.75 + t = 5.390964663 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + t = 5.390964663 + 3.75 t = 5.390964663 + 3.75 Combine like terms: 5.390964663 + 3.75 = 9.140964663 t = 9.140964663 Simplifying t = 9.140964663

Subproblem 2

t + -3.75 = -5.390964663 Simplifying t + -3.75 = -5.390964663 Reorder the terms: -3.75 + t = -5.390964663 Solving -3.75 + t = -5.390964663 Solving for variable 't'. Move all terms containing t to the left, all other terms to the right. Add '3.75' to each side of the equation. -3.75 + 3.75 + t = -5.390964663 + 3.75 Combine like terms: -3.75 + 3.75 = 0.00 0.00 + t = -5.390964663 + 3.75 t = -5.390964663 + 3.75 Combine like terms: -5.390964663 + 3.75 = -1.640964663 t = -1.640964663 Simplifying t = -1.640964663

Solution

The solution to the problem is based on the solutions from the subproblems. t = {9.140964663, -1.640964663}

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