(-a-2b+3)7ab =

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johnperkins · Answer 1 · 2014-05-13T05:29:11+0000

(-a -2b +3) * (7ab)

the 7ab hits each thing inside the first part:

-a(7ab) -2b(7ab) +3(7ab)

now just multiply it out:

-7(a^2)b -14a(b^2) +21ab