what is the factor for y2 - 49?

y² - 49 is the DIFFERENCE OF SQUARES. You need to recognize this form of polynomial!

a² - b² = (a+b)(a-b)

Option a

y² - 49 = (y - 7)(y + 7)

a^2 - b^2 = (a + b)(a - b)

y^2 - 49
= y^2 - 7^2
= (y + 7)(y - 7)
(answer a)

option A

(a^2 - b^2) = (a + b)(a - b)

(y^2 - 49) = (y^2 - 7^2)

= (y + 7)(y - 7)

Ans. (A) = (y + 7)(y - 7)

aaa

Use (a^2 - b^2) = (a+b) (a-b)
So (y^2- 49) = (y^2 - 7^2)
= (y+7)(y-7)

a^2 - b^2 = (a - b) (a + b)

= y^2 - 49

= y^2 - 7^2

= (y - 7) (y + 7) Option A.

A . (y+7) (y-7)

y² - 49 = (y + 7)(y -7)
Answer a)