Question

The factorization of 9x² -3x-20 is (A) (3x-4) (3x + 5) (B) (3x+4) (3x-5) (c) (3x+4)(3x+5) (D) (3x-4) (3x-5)​

Answer 1

Answer:

Correct option is

B

Step-by-step explanation:

-1

Hence,

(3x−4)(5x+7)=15x2−ax−28

⇒15x2+21x−20x−28=15x2−ax−28

⇒15x2+x−28=15x2−ax−28

Equating the terms having similar powers:-

⇒x=−ax

⇒a=−1

⇒ Option B is correct.