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Factorize 20x² - 9x - 20?
  1. (4x − 5)(5x − 4)
  2. (4x + 5)(5x − 4)
  3. (4x − 5)(5x + 4)
  4. None of these
Explanation

20x² - 9x - 20

Multiply 20 × -20 = -400  

Find 2 numbers for -400 that add to -9 → 16 and -25  

Write 20x² + 16x - 25x - 20

Take common 4x(5x + 4) - 5(5x + 4)

Both have (5x + 4), so (4x - 5)(5x + 4)


Last verified on 17-06-2026

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