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)
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Answer:
Hence,
(3x−4)(5x+7)=15x
2
−ax−28
⇒15x
2
+21x−20x−28=15x
2
−ax−28
⇒15x
2
+x−28=15x
2
−ax−28
Equating the terms having similar powers:-
⇒x=−ax
⇒a=−1
⇒ Option B is correct.
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