Algebra:'(

posted by EmilyMay

I understand how to multiply a polynomial by a monomial for example

6pq(3p^2+4q)= 18p^3q+24pq^2

but i don't know how to do problems like this

5(2s-1)+3=3(3s+2)

HELP PLEASE!!

  1. Ms. Sue

    5(2s-1)+3=3(3s+2)

    10s - 5 + 3 = 9s + 6

    s = 6 + 5 - 3

    s = 8

  2. EmilyMay

    how did you get the 's' by its self?

  3. EmilyMay

    Did you take 9 and subtract it by 10 to get 1s but you just dropped the 1 because a variable always has and invisible 1?

  4. Ms. Sue

    Yes. I subtracted 9s from both sides.

  5. EmilyMay

    Ohhh kayy thanks i didn't see at first... Thank You!!

  6. Ms. Sue

    You're welcome. :-)

  7. EmilyMay

    just to be sure did i do this right?

    3(3u+2)+5=2(2u-2)
    9u+6+5=4u-4
    5u=-15
    5/5=-15/5
    u=-3

  8. Ms. Sue

    Right.

  9. EmilyMay

    =)

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