15t+2t^2=100

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Solution for 15t+2t^2=100 equation:


Simplifying
15t + 2t2 = 100

Solving
15t + 2t2 = 100

Solving for variable 't'.

Reorder the terms:
-100 + 15t + 2t2 = 100 + -100

Combine like terms: 100 + -100 = 0
-100 + 15t + 2t2 = 0

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

Divide each side by '2'.
-50 + 7.5t + t2 = 0

Move the constant term to the right:

Add '50' to each side of the equation.
-50 + 7.5t + 50 + t2 = 0 + 50

Reorder the terms:
-50 + 50 + 7.5t + t2 = 0 + 50

Combine like terms: -50 + 50 = 0
0 + 7.5t + t2 = 0 + 50
7.5t + t2 = 0 + 50

Combine like terms: 0 + 50 = 50
7.5t + t2 = 50

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 = 50 + 14.0625

Reorder the terms:
14.0625 + 7.5t + t2 = 50 + 14.0625

Combine like terms: 50 + 14.0625 = 64.0625
14.0625 + 7.5t + t2 = 64.0625

Factor a perfect square on the left side:
(t + 3.75)(t + 3.75) = 64.0625

Calculate the square root of the right side: 8.003905297

Break this problem into two subproblems by setting 
(t + 3.75) equal to 8.003905297 and -8.003905297.

Subproblem 1

t + 3.75 = 8.003905297 Simplifying t + 3.75 = 8.003905297 Reorder the terms: 3.75 + t = 8.003905297 Solving 3.75 + t = 8.003905297 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 = 8.003905297 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + t = 8.003905297 + -3.75 t = 8.003905297 + -3.75 Combine like terms: 8.003905297 + -3.75 = 4.253905297 t = 4.253905297 Simplifying t = 4.253905297

Subproblem 2

t + 3.75 = -8.003905297 Simplifying t + 3.75 = -8.003905297 Reorder the terms: 3.75 + t = -8.003905297 Solving 3.75 + t = -8.003905297 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 = -8.003905297 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + t = -8.003905297 + -3.75 t = -8.003905297 + -3.75 Combine like terms: -8.003905297 + -3.75 = -11.753905297 t = -11.753905297 Simplifying t = -11.753905297

Solution

The solution to the problem is based on the solutions from the subproblems. t = {4.253905297, -11.753905297}

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