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math

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factorise

1. 3a^2 - 2a - 8

2. 3x^2 + 31 + 10

3. 64y^2 - 49

please help

thankyou

  • math -

    well, 6 and 4 differ by 2
    so
    (3a+4)(a-2)

    I need 30 and 1 so
    (3x+1)(x+10)

    difference of 2 squares
    a^2-b^2 = (a-b)(a+b)
    here a = 8y and b = 7

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