x2-x-42 এর উৎপাদক কোনটি?

A (x+6)(x-7)

B (x-6)(x-7)

C (x-6)(x+7)

D (x+6)(x+7)

Solution

Correct Answer: Option A

x2-x - 42

⇒ x2 -7x + 6x42

⇒  x(x - 7) + 6 (x-7)

⇒(x-7)(x+6)

 

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