Question: Simplify the following expression. (2x5^n)^2 + 25^n this whole equation is divided by 5^n Answer; 5^n+1 Remarks: I have tried doing this question twice but both attempts were unsuccesful. Please help.
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Originally Posted by econlover Question: Simplify the following expression. (2x5^n)^2 + 25^n this whole equation is divided by 5^n Answer; 5^n+1 Remarks: I have tried doing this question twice but both attempts were unsuccesful. Please help. 1. Use the laws of powers:
Last edited by earboth; Jun 19th 2010 at 06:34 AM.
Thanks. I understand most of it but how did you move along from the 1st step of your answer to the second one that is, in specific terms, where did the 4 go?
considering the numerator (top of fraction) only:
Thanks for the message. But I guess you misinterpret the sign of this "." It is not 4.5 (4 decimal 5) but 4 . 5 meaning 4 x 5 = 4 times 5 Hope this clears up the misconception
Still don't understand this step. Where did the 1 come from ? What about the positive sign? Can someone explain? Thanks!
it is only factorising. i was not interpreting your dot as a decimal. in general: 4x + x = (4+1)x = 5x You have = Which says: "4 lots of plus 1 lot of " equals "5 lots of "
Last edited by SpringFan25; Jun 16th 2010 at 12:13 PM.
Originally Posted by econlover Question: Simplify the following expression. (2x5^n)^2 + 25^n this whole equation is divided by 5^n Answer; 5^n+1 Remarks: I have tried doing this question twice but both attempts were unsuccesful. Please help. Hi ecolover, answer is correct 5^n+1 follow exp rules carefully. the 4 disappears naturally because 4+1 =5 You should get it from this clue bjh
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