Question

. use a suitable identity find the product. 1) (7 a - 5) ^3​

Answer 1

To find : (7a-5)^3

Identity to be used: (x-y)^3 = x^3+(y^3) +(3x^2*y) + (3*x*y^2)

Solution:

(7a-5)^3

=(7a)^3 + (-5)^3 + (3*(7a)^2*-5) + (3*7a*(-5)^2)

= 343a^3 -125 -735a^2 + 525a

Since it cannot be further simplified, this is our required answer.

Hope it helps :)