0=15+10t-5t^2

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Solution for 0=15+10t-5t^2 equation:


Simplifying
0 = 15 + 10t + -5t2

Solving
0 = 15 + 10t + -5t2

Solving for variable 't'.

Combine like terms: 0 + -15 = -15
-15 + -10t + 5t2 = 15 + 10t + -5t2 + -15 + -10t + 5t2

Reorder the terms:
-15 + -10t + 5t2 = 15 + -15 + 10t + -10t + -5t2 + 5t2

Combine like terms: 15 + -15 = 0
-15 + -10t + 5t2 = 0 + 10t + -10t + -5t2 + 5t2
-15 + -10t + 5t2 = 10t + -10t + -5t2 + 5t2

Combine like terms: 10t + -10t = 0
-15 + -10t + 5t2 = 0 + -5t2 + 5t2
-15 + -10t + 5t2 = -5t2 + 5t2

Combine like terms: -5t2 + 5t2 = 0
-15 + -10t + 5t2 = 0

Factor out the Greatest Common Factor (GCF), '5'.
5(-3 + -2t + t2) = 0

Factor a trinomial.
5((-1 + -1t)(3 + -1t)) = 0

Ignore the factor 5.

Subproblem 1

Set the factor '(-1 + -1t)' equal to zero and attempt to solve: Simplifying -1 + -1t = 0 Solving -1 + -1t = 0 Move all terms containing t to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + -1t = 0 + 1 Combine like terms: -1 + 1 = 0 0 + -1t = 0 + 1 -1t = 0 + 1 Combine like terms: 0 + 1 = 1 -1t = 1 Divide each side by '-1'. t = -1 Simplifying t = -1

Subproblem 2

Set the factor '(3 + -1t)' equal to zero and attempt to solve: Simplifying 3 + -1t = 0 Solving 3 + -1t = 0 Move all terms containing t to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1t = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1t = 0 + -3 -1t = 0 + -3 Combine like terms: 0 + -3 = -3 -1t = -3 Divide each side by '-1'. t = 3 Simplifying t = 3

Solution

t = {-1, 3}

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