1. Simplify 2√45 -2√5.
a. 2√5
b. 9√5
c. 5√5
d. 4√5
2.Simplify -3√18 +3√8 -√24.
a. -2√6-3√2
b. -2√6
c. -3√2
d. 1√4
3. Simplify √20
a. 5√2
b. 2√5
c. 5
d. 10²
a. 2√5
b. 9√5
c. 5√5
d. 4√5
2.Simplify -3√18 +3√8 -√24.
a. -2√6-3√2
b. -2√6
c. -3√2
d. 1√4
3. Simplify √20
a. 5√2
b. 2√5
c. 5
d. 10²
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Answer:
1. 2√45 - 2√5
2√3² × 5 - 2√5
2√3²√5 - 2√5
2×3√5 - 2√5
6√5 - 2√5
= 4√5 (D)
2. -3√18 + 3√8 - √24
-3√3² × 2 + 3√2² × 2 - √2² × 6
-3√3²√2 + 3√2²√2 - √2²√6
-3 × 3√2 + 3×2√2 - 2√6
-9√2 + 6√2 - 2√6
= -3√2 - 2√6 (A)
3. √20
√2² × 5
√2²√5
= 2√5 (B)