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Simplifying 420 = -16t2 + 86t + 480 Reorder the terms: 420 = 480 + 86t + -16t2 Solving 420 = 480 + 86t + -16t2 Solving for variable 't'. Combine like terms: 420 + -480 = -60 -60 + -86t + 16t2 = 480 + 86t + -16t2 + -480 + -86t + 16t2 Reorder the terms: -60 + -86t + 16t2 = 480 + -480 + 86t + -86t + -16t2 + 16t2 Combine like terms: 480 + -480 = 0 -60 + -86t + 16t2 = 0 + 86t + -86t + -16t2 + 16t2 -60 + -86t + 16t2 = 86t + -86t + -16t2 + 16t2 Combine like terms: 86t + -86t = 0 -60 + -86t + 16t2 = 0 + -16t2 + 16t2 -60 + -86t + 16t2 = -16t2 + 16t2 Combine like terms: -16t2 + 16t2 = 0 -60 + -86t + 16t2 = 0 Factor out the Greatest Common Factor (GCF), '2'. 2(-30 + -43t + 8t2) = 0 Factor a trinomial. 2((-5 + -8t)(6 + -1t)) = 0 Ignore the factor 2.Subproblem 1
Set the factor '(-5 + -8t)' equal to zero and attempt to solve: Simplifying -5 + -8t = 0 Solving -5 + -8t = 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 + -8t = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -8t = 0 + 5 -8t = 0 + 5 Combine like terms: 0 + 5 = 5 -8t = 5 Divide each side by '-8'. t = -0.625 Simplifying t = -0.625Subproblem 2
Set the factor '(6 + -1t)' equal to zero and attempt to solve: Simplifying 6 + -1t = 0 Solving 6 + -1t = 0 Move all terms containing t to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + -1t = 0 + -6 Combine like terms: 6 + -6 = 0 0 + -1t = 0 + -6 -1t = 0 + -6 Combine like terms: 0 + -6 = -6 -1t = -6 Divide each side by '-1'. t = 6 Simplifying t = 6Solution
t = {-0.625, 6}
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