Question

. Using the identities,simplify (3x + 7y)(3x + 5y)​

Answer 1

Answer:

80xy Square

Step-by-step explanation:

(3x+7y)(3x+5y)

10xy×8xy

80xy square

Answer 2

Answer:

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

Step-by-step explanation:

x = 3x

a = 7y

b = 5y

= ( 3x)2 + 3x ( 7y + 5y ) + 7y × 5y

= 9x2 + 3x( 12y) + 35y2

= 9x2 + 36xy + 35y2.