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Simplifying 21t2 + 8t + -5 = 0 Reorder the terms: -5 + 8t + 21t2 = 0 Solving -5 + 8t + 21t2 = 0 Solving for variable 't'. Factor a trinomial. (-5 + -7t)(1 + -3t) = 0Subproblem 1
Set the factor '(-5 + -7t)' equal to zero and attempt to solve: Simplifying -5 + -7t = 0 Solving -5 + -7t = 0 Move all terms containing t to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + -7t = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -7t = 0 + 5 -7t = 0 + 5 Combine like terms: 0 + 5 = 5 -7t = 5 Divide each side by '-7'. t = -0.7142857143 Simplifying t = -0.7142857143Subproblem 2
Set the factor '(1 + -3t)' equal to zero and attempt to solve: Simplifying 1 + -3t = 0 Solving 1 + -3t = 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 + -3t = 0 + -1 Combine like terms: 1 + -1 = 0 0 + -3t = 0 + -1 -3t = 0 + -1 Combine like terms: 0 + -1 = -1 -3t = -1 Divide each side by '-3'. t = 0.3333333333 Simplifying t = 0.3333333333Solution
t = {-0.7142857143, 0.3333333333}
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