JAMB - Mathematics (2015 - No. 52)
Simplify \(\sqrt{30}\) × \(\sqrt{40}\)
10 √3
5 √3
20 √3
15 √3
คำอธิบาย
\(\sqrt{30}\) × \(\sqrt{40}\)
= \(\sqrt{(30 × 40)}\)
\(\sqrt{(3 × 10 × 4 × 10)}\)
\(\sqrt{(400 × 3)}\)
\(\sqrt{400}\) × \(\sqrt{3}\)
20 × \(\sqrt{3}\)
20\(\sqrt{3}\)
= \(\sqrt{(30 × 40)}\)
\(\sqrt{(3 × 10 × 4 × 10)}\)
\(\sqrt{(400 × 3)}\)
\(\sqrt{400}\) × \(\sqrt{3}\)
20 × \(\sqrt{3}\)
20\(\sqrt{3}\)