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ajime
29.04.2021 •
Mathematics
You want to buy a $144,000 home. You plan to pay 15% as a down payment, and take out a 30 year
loan at 5.3% interest for the rest.
a) How much is the loan amount going to be?
$
b) What will your monthly payments be?
$
c) How much of the first payment is interest?
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Ответ:
answer:
step-by-step explanation:
use the fact that a^2-b^2=(a+b)(a-b). in this case a=n+1, b=n-1.
i am using "4|expression" to denote that 4 should divide the expression:
4|[(n+1)^2-(n-1)^2]\implies 4|(n+1+n-1)(n+1-n+1)\implies\\\implies4|2n\cdot2\implies 4|4n \,\,\,\mbox{true for all }n\in n
(b)
same trick
8|[(2n+3)^2-(2n-1)^2]\implies 8|(2n+3+2n-1)(2n+3-2n+1)\implies\\\implies 8|(2n+2)\cdot4 \implies 8|8(n+1)\,\,\,\mbox{true for all } n\in n