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Mathematics, 22.04.2021 18:40 husk84

3. Which is not a quadratic equation? (1) x2 = 81
(2) 3x2 = 5x - 7
(3) 4x + 5 =9-2x
(4) 5x - 7x2 = 21

Pls pls help this is due in 20 mins

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3. Which is not a quadratic equation? (1) x2 = 81
(2) 3x2 = 5x - 7
(3) 4x + 5 =9-2x

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