0=4t^3-42t^2+90t

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Solution for 0=4t^3-42t^2+90t equation:


Simplifying
0 = 4t3 + -42t2 + 90t

Reorder the terms:
0 = 90t + -42t2 + 4t3

Solving
0 = 90t + -42t2 + 4t3

Solving for variable 't'.
Remove the zero:
-90t + 42t2 + -4t3 = 90t + -42t2 + 4t3 + -90t + 42t2 + -4t3

Reorder the terms:
-90t + 42t2 + -4t3 = 90t + -90t + -42t2 + 42t2 + 4t3 + -4t3

Combine like terms: 90t + -90t = 0
-90t + 42t2 + -4t3 = 0 + -42t2 + 42t2 + 4t3 + -4t3
-90t + 42t2 + -4t3 = -42t2 + 42t2 + 4t3 + -4t3

Combine like terms: -42t2 + 42t2 = 0
-90t + 42t2 + -4t3 = 0 + 4t3 + -4t3
-90t + 42t2 + -4t3 = 4t3 + -4t3

Combine like terms: 4t3 + -4t3 = 0
-90t + 42t2 + -4t3 = 0

Factor out the Greatest Common Factor (GCF), '2t'.
2t(-45 + 21t + -2t2) = 0

Factor a trinomial.
2t((-15 + 2t)(3 + -1t)) = 0

Ignore the factor 2.

Subproblem 1

Set the factor 't' equal to zero and attempt to solve: Simplifying t = 0 Solving t = 0 Move all terms containing t to the left, all other terms to the right. Simplifying t = 0

Subproblem 2

Set the factor '(-15 + 2t)' equal to zero and attempt to solve: Simplifying -15 + 2t = 0 Solving -15 + 2t = 0 Move all terms containing t to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 2t = 0 + 15 Combine like terms: -15 + 15 = 0 0 + 2t = 0 + 15 2t = 0 + 15 Combine like terms: 0 + 15 = 15 2t = 15 Divide each side by '2'. t = 7.5 Simplifying t = 7.5

Subproblem 3

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 = {0, 7.5, 3}

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