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

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Answer 1 · 2017-02-28T12:21:47

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

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

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

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

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

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