x²-9x+20 এর উৎপাদকসমূহ কোনটি?

A (x+5)(x+4)

B (x-5)(x-4)

C (x+5)(x-4)

D (x-5)(x+4)

Solution

Correct Answer: Option B

x²-9x+20 = x² - 5x - 4x + 20 

               = x(x - 5) - 4 (x - 5) 

              = (x - 5) (x - 4)   

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