Question

Find the following products using suitable identities:
a) (y+3) (y─7)
b) (2y+5) (2y-5)

Answer 1

Step-by-step explanation:

b) using identity ( x+y)(x-y)=x^2-y^2

. .. 2y^2-5^2

4y^2-25

a) using identity = (x+a)(x+b)=x^2+2ab+b^2

(y+3)(y-7)=y^2+2(3)(-7)+(-7)^2

= y^2-42+49

= y^2+7

Answer 2

Answer:

the answer is

Step-by-step explanation:

1. y2-4y-21
2. 4y2-25