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18 December, 00:04

Which equations are true for x = - 2 and x = 2? Check all that apply.

A. x2 - 4 = 0

B. x2 = - 4

C. 3x2 + 12 = 0

D. 4x2 = 16

E. 2 (x - 2) 2 = 0

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Answers (1)
  1. 18 December, 03:54
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    А. х²-4=0; х²=4; х=±2, true. B. x²=-4; there is no solution. C. 3x²+12=0; 3x²=-12; x²=-4; there is no solution. D. 4x²=16; x²=4; x=±2, true. E. 2 (x-2) ²=0; 2 (x²-4x+4) = 0; 2x²-8x+8=0; x²-4x+4=0; x1=2; x2=2. False. The answer: A, D.
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