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Simplifying 21x2 + 42x + k = 0 Reorder the terms: k + 42x + 21x2 = 0 Solving k + 42x + 21x2 = 0 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-42x' to each side of the equation. k + 42x + -42x + 21x2 = 0 + -42x Combine like terms: 42x + -42x = 0 k + 0 + 21x2 = 0 + -42x k + 21x2 = 0 + -42x Remove the zero: k + 21x2 = -42x Add '-21x2' to each side of the equation. k + 21x2 + -21x2 = -42x + -21x2 Combine like terms: 21x2 + -21x2 = 0 k + 0 = -42x + -21x2 k = -42x + -21x2 Simplifying k = -42x + -21x2
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