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earnstyle [38]
2 years ago
15

2√7 times 3 √21 simply

Mathematics
1 answer:
ElenaW [278]2 years ago
8 0
21=3*7
(2√7)(3√(3*7)=6√(3*7²)=6*7(√3)=42√3

Answer: (2√7)(3√21)=42√3
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Limit   
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Rationalize the numerator:

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This is continuous at x=0, so we can evaluate the limit directly by substitution:

\displaystyle\lim_{x\to0}\frac{\sqrt{x+4}-2}x=\lim_{x\to0}\frac1{\sqrt{x+4}+2}=\frac1{\sqrt4+2}=\frac14

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