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I need helpwith these 3 questions please!
1. radical 10 (11+ radical 5)
2. 7 over 10i
3. radical 49 over (3+4i)(25i)
Please help!
 2 years ago
 2 years ago
I need helpwith these 3 questions please! 1. radical 10 (11+ radical 5) 2. 7 over 10i 3. radical 49 over (3+4i)(25i) Please help!
 2 years ago
 2 years ago

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Leelee12Best ResponseYou've already chosen the best response.1
What are the questions here? I'm not sure I understand. Do you need to simplify? Rationalize?
 2 years ago

mckayla_04Best ResponseYou've already chosen the best response.0
yes simplify. im sorry
 2 years ago

RohangrrBest ResponseYou've already chosen the best response.0
1. 10√(1/5)  √45  12√(5/9) 10√(1/5)  √9√5 (12/3)√5 10√(1/5)  3√5  4√5 10√(1/5)  7√5 2. You have to know that each numbers has factors 10 has the factors 10 and 1 and 5 and 2 12 has factors 12 and 1, 6 and 2 and 4 and 3 You simplify by doing the same to numerator (top number) and denomiator (bottom number). The only common factors are 1 and 2. Since 1 leaves you with the same expression you take the higher number 2 to get 5/6. If you knew multiplication tables you would see the answer inherently. I am not sure those tables are taught in schools anymore. They are here: http://www.mathsisfun.com/timestable.htm… 3.i dont know
 2 years ago

satellite73Best ResponseYou've already chosen the best response.0
\[\frac{7}{10i}=\frac{7}{10i}\times \frac{i}{i}=\frac{7i}{10}=\frac{7i}{10}\]
 2 years ago

satellite73Best ResponseYou've already chosen the best response.0
#3, first of \[\sqrt{49}=7\] and \[(3+4i)(25i)=1i\]so start with \[\frac{7}{1i}\]
 2 years ago

satellite73Best ResponseYou've already chosen the best response.0
then \[\frac{7}{1i}=\frac{7}{1i}\times \frac{1+i}{1+i}=\frac{7(1+i)}{2}\]
 2 years ago

satellite73Best ResponseYou've already chosen the best response.0
last line because \[(a+bi)(abi)=a^2+b^2\]
 2 years ago

satellite73Best ResponseYou've already chosen the best response.0
then standard form looks like \[\frac{7}{2}+\frac{7}{2}i\]
 2 years ago

mckayla_04Best ResponseYou've already chosen the best response.0
the answers to the first question is A.11 radical 10 + 5 radical 2 B. 5 radical 2 + 11i radical 10 C. 5 radical 2  11i radical 10 D. 11 radical 10 + 5 radical 2
 2 years ago

mckayla_04Best ResponseYou've already chosen the best response.0
yeah, they were all wrong..
 2 years ago

mckayla_04Best ResponseYou've already chosen the best response.0
thanks for your effort though
 2 years ago
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