Question

Factorise 16x5 — 144x3

Answer 1

16xpower5 - 144x³

Dividing the whole eqn. by x³  [As x³ is common],

We get:

(16x² - 144x)   ÷ 16

⇒ x² - 9x + 0

   Prod = 0

   Sum = -9

∴ x² + 0x - 9x + 0

  x(x + 0) -9(x + 0)

  (x - 9) (x + 0)

⇒ x = 9 and x = 0

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