Question

Use identities to find: (3x-4/5) (3x+4/5)​

Answer 1

Suitable identity is (x+a)(x+b)=x2+(a+b)x+ab

(3x+4)(3x−5)=(3x) 2

+(+4−5)3x+(4×−5)

9x

2

+(−1)3x+(−20)

9x

2

−3x−20

Answer 2

Answer:

$(3x - \frac{4}{5} )(3x + \frac{4}{5} )$

taking identity

(a-b )(a+b) = a²-b²

$( {3x})^{2} - ( { \frac{4}{2} })^{2} \\ 9{x}^{2} - \frac{16}{25}$

so answer the will be

9x²-16/25

hope it help