Question

use suitable identity to find the following : (3x +4) (3x - 5)​

Answer 1

Step-by-step explanation:

Suitable identity is (x+a)(x+b)=x

2

+(a+b)x+ab

(3x+4)(3x−5)=(3x)

2 +(+4−5)3x+(4×−5) 9x

2 +(−1)3x+(

2

−3x−20

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Answer 2

Answer:

(a+b)(a-b)= a²- b²

Step-by-step explanation:

= 3x² - 5²

= 9x² - 25