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$(x+3)(x−9)18−2x $

SplitIntoFactorsSplit into factors

$(x+3)(x−9)2⋅9−2⋅x $

FactorOutFactor out $2$

$(x+3)(x−9)2⋅(9−x) $

b

$5−xx_{2}−25 $

WritePowWrite as a power

$5−xx_{2}−5_{2} $

FacDiffSquares$a_{2}−b_{2}=(a+b)(a−b)$

$5−x(x+5)(x−5) $