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9 April, 14:48

1. Factorise

a y2 - 49

+1
Answers (1)
  1. 9 April, 15:40
    0
    (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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