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)
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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