Factorise $9x^{2} - 25$.

Factorise $9x^{2} - 25$.
  1. $(3x - 5)(3x + 5)$
  2. $(9x - 25)(x + 1)$
  3. $(3x - 5)^{2}$
  4. $(9x - 5)(x + 5)$

Solution

$(3x)^{2} - 5^{2} = (3x-5)(3x+5)$.

Asked in: MH-SSC-9

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