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Simplifying -4k2 + 19k + -21 = 0 Reorder the terms: -21 + 19k + -4k2 = 0 Solving -21 + 19k + -4k2 = 0 Solving for variable 'k'. Factor a trinomial. (-3 + k)(7 + -4k) = 0Subproblem 1
Set the factor '(-3 + k)' equal to zero and attempt to solve: Simplifying -3 + k = 0 Solving -3 + k = 0 Move all terms containing k to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + k = 0 + 3 Combine like terms: -3 + 3 = 0 0 + k = 0 + 3 k = 0 + 3 Combine like terms: 0 + 3 = 3 k = 3 Simplifying k = 3Subproblem 2
Set the factor '(7 + -4k)' equal to zero and attempt to solve: Simplifying 7 + -4k = 0 Solving 7 + -4k = 0 Move all terms containing k to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -4k = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -4k = 0 + -7 -4k = 0 + -7 Combine like terms: 0 + -7 = -7 -4k = -7 Divide each side by '-4'. k = 1.75 Simplifying k = 1.75Solution
k = {3, 1.75}
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