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How do you combine like terms in #(r - 3) ( r + 1) + ( r - 3) ( r + 8)#?

1 Answer

Feb 28, 2017

#(2r-3)(r+9)#

Explanation:

#(r-3)(r+1)+(r-3)(r+8)#

#:.=(r^2-2r-3)+(r^2+8r-24)#

#:.=2r^2+6r-27#

#:.=(2r-3)(r+9)#

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