Question

Use a suitable identity to find the product
(a) (2y + 5) (2y + 5)
(b) (x - 7) (x + 7)​

Answer 1

Answer:

a)= (2y+5)²

By using (a+b)² = a² +2ab+b²

= 4y² + 20y + 25

b). = by using (a+b)(a-b)= a²-b²

= x²-7²

= ײ- 49

Answer 2

Answer:

(a) (2y + 5) (2y + 5)

$(2y + 5)^{2}$

(b) (x-7) (x+7)

$( {x}^{2} - {7}^{2} )$