alishba60 alishba60
  • 14-03-2020
  • Mathematics
contestada

1. Factorise
a y2 - 49​

Respuesta :

jimrgrant1 jimrgrant1
  • 14-03-2020

Answer:

(y - 7)(y + 7)

Step-by-step explanation:

Given

y² - 49 ← this is a difference of squares and factors in general as

a² - b² = (a - b)(a + b), thus

y² - 49

= y² - 7²

= (y - 7)(y +7)

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