Mathematics

Natasha Burke

18 September, 20:46

Lisa solved 3x2 + 1 = 28 as shown. 3x2 + 1 = 28 3x2 = 27 x2 = 9 She concluded that the solutions to this quadratic equation are x = - 9 or x = 9. What are the correct solutions to this quadratic and how did you arrive at your answer?

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