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artcher [175]
3 years ago
10

Simplify the expression: 2√ 20 − 3√ 7 − 2√ 5 + 4√ 63 . A. 2√ 20 − 3√ 7 − 2√ 5 + 4√ 63 B. 2√ 5 + 9√ 7 C. 2√ 20 − 4√ 7 − 2√ 5 D. 2

√ 20 − 3√ 7 + 4√ 63
Mathematics
2 answers:
noname [10]3 years ago
8 0
2 \sqrt{20}- 3\sqrt{7}-2 \sqrt{5}+4 \sqrt{63}=2 \sqrt{4*5}- 3\sqrt{7}-2 \sqrt{5}+4 \sqrt{9*7}= \\ \\ 2 *2\sqrt{5}- 3\sqrt{7}-2 \sqrt{5}+4*3 \sqrt{7}=4\sqrt{5}- 3\sqrt{7}-2 \sqrt{5}+12 \sqrt{7}= \\ \\ =2 \sqrt{5}+9 \sqrt{7}

Answer: <span>B. 2√5 + 9√7 </span>
ipn [44]3 years ago
7 0
B is the right option. hope it helps
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