How do you combine like terms in #7( y - 4) - 5y ( y - 4)#?

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Answer 1 · 2016-12-12T13:59:48

#-5y^2 + 27y - 28#

First, expand the terms in parenthesis - be sure to treat the signs correctly:

#7y - 28 - 5y^2 + 20y#

Now, group the like terms:

#-5y^2 + 7y + 20y - 28#

Now combine like terms:

#-5y^2 + (7 + 20)y - 28#

#-5y^2 + 27y - 28#