Question

use identities and solve (5x+3) (5x+7)​

Answer 1

Answer:

25x²+50x+21

Step-by-step explanation:

Using identity,

(x+a)(x+b)= x²+(a+b)x+(ab)

Where,

• x= 5x

• a= 3
• b= 7

(5x+3)(5x+7)= (5x)²+(3+7)5x+(3×7)

=> 25x²+50x+21

hope it helps :)

Answer 2

Answer:

identity: (x+a)(x+b)= x²+(a+b)x+(a*b)

Step-by-step explanation:

(5x)²+ (3+7)5x+ 3*7

=25x²+50x+21