Answer:
20[tex]x^{4}[/tex][tex]y^{6}[/tex]
Step-by-step explanation:
using the law of exponents
[tex]a^{m}[/tex] × [tex]a^{n}[/tex] = [tex]a^{(m+n)}[/tex]
4[tex]x^{4}[/tex][tex]y^{2}[/tex] × 5[tex]y^{4}[/tex]
= (4 × 5 ) × [tex]x^{4}[/tex] × [tex]y^{(2+4)}[/tex]
= 20[tex]x^{4}[/tex][tex]y^{6}[/tex]
