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√5 × √2
= √(5×2)
= √10
SOAL B
2√13 × √9
= 2 × √13 × √9
= 2 × √13 × 3
= 2 × 3 × √13
= 6√13
SOAL C
Ingat sifat distributif
a(b+c) = ab + ac
√6 (5 + √12)
= 5√6 + √(6×12)
= 5√6 + √(6×6×2)
= 5√6 + √(6×6) + √2
= √5 + √6² + √2
= 5√6 + 6 + √2
SOAL D
Ingat sifat
(a + b)(a - b) = a² - b²
(√2 + √3)(√2 - √3)
= (√2)² - (√3)²
= 2 - 3
= -1
SOAL E
28√11 - 10√11
= 18√11
SOAL F
7√19 - 2√19
= 5√19
SOAL G
-√29 - √29
= -1√29 -1√29
= -2√29
SOAL H
-32√33 -√33
= -32√33 -1√33
= -33√33