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CDS 2022 · PYQ · Algebra · medium

If squaring a positive real number x is same as adding 12, then what is x equal to?

  1. A.4✓ Correct
  2. B.2
  3. C.3
  4. D.5

Explanation

x² = x + 12, x² - x - 12 = 0, (x-4)(x+3) = 0, positive root x = 4.
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