Answer:
[tex]\boxed{\bold{-21x^3y^4}}[/tex]
Explanation:
[ Step One ] Remove Parenthesis: (a) = a
[tex]\bold{-3x^2y\cdot \:7xy^3}[/tex]
[ Step Two ] Multiply: [tex]\bold{3\cdot \:7=21}[/tex]
[tex]\bold{-21x^2xy^3y}[/tex]
[ Step Three ] Apply Exponent Rule [tex]\bold{\:a^b\cdot \:a^c=a^{b+c}: \ x^2x=\:x^{2+1}=\:x^3}[/tex]
[tex]\bold{-21x^3y^3y}[/tex]
[ Step Four ] Apply Exponent Rule: [tex]\bold{y^3y=\:y^{1+3}=\:y^4}[/tex]
[tex]\bold{-21x^3y^4}[/tex]
[ [tex]\boxed{\bold{Final \ Answer}}[/tex] ]
➤ [tex]\bold{-21x^3y^4}[/tex]
[tex]\boxed{\bold{Mordancy}}[/tex]
