Question

Use suitable identities to find the following products:(3x+4)(3x-5)

Answer 1

Answer:

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+(−20)

9x

2

−3x−20