thank you in advance

Answer:
[tex] 75\sqrt{5} [/tex]
Step-by-step explanation:
Product of [tex] 5\sqrt{5} [/tex] and [tex] 5\sqrt{15} [/tex]
[tex] 5\sqrt{5} \times 5\sqrt{15} [/tex]
[tex] 5 \times 5 \sqrt{5 \times 15} [/tex]
[tex] 15\sqrt{75} [/tex]
[tex] 15\sqrt{25 \times 5} [/tex]
[tex] 15 \times 5\sqrt{5} [/tex]
[tex] 75\sqrt{5} [/tex]