help!

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factor
a - 10a + 21

  • help! -

    I think that you didn't write the question well , because it would me much more logically that your homework goes like this a^2 - 10a + 21
    then this is :
    a^2 - 7a-3a + 21
    a (a-7) – 3 (a-7)
    (a-3)(a-7)


    a - 10a + 21 - like this is : -9a + 21 = -3(3a-7)

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