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Mathematics, 22.09.2021 14:00 minnie7760

6. Which of the following quadratic equation canbe easily solved by extracting the square roots? aligned 21=0\\ ;=0 aligned a. x ^ 2 - 4x - 21 = 0 b. 4x ^ 2 - 25 = 0 c. 3x ^ 2 - 6x - 21 = 0 d. x ^ 2 + 9x + 18 = 0

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