You need the associative and commutative properties, but not the distributive property.
n*4n*9 =n*(4n*9) (associative)
= n*(9*4n) (commutative)
= n*(36n) (associative)
= 36n*n commutative
= 36*n^2
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It is: 3n-21+4n+8 = 7n-13 simplified
4n is multiplied by 4n.
4 + 4n - 12 = 4n - 8
4n + 3 = 15 4n +3 - 3 = 15 - 3 4n = 12 4n/4 = 12/4 n = 3
4n-1 = 3