Asked by Kira
There are two numbers twice as far from 14 as they are from 20 what are the numbers?
Answers
Answered by
bobpursley
(abs(x-14))=2abs(x-20) square each side to get away from absolute value .
(x-14)^2=4*(x-20)^2
multiply those out, gather terms, and you get
x^2-44x+468=0 which factors to
(x-27)(x-17)=0 and you have the two numbers.
(x-14)^2=4*(x-20)^2
multiply those out, gather terms, and you get
x^2-44x+468=0 which factors to
(x-27)(x-17)=0 and you have the two numbers.
Answered by
Steve
|x-14| = 2|x-20|
Clearly x cannot be less than 14, since it will then be closer to 14 than to 20
So, if 14 < x < 20 we have x-20 < 0, so
x-14 = 2(20-x)
x = 18
18 is 4 away from 14 and 2 away from 20
Or, note that since 20 is 6 away from 14, x will be 2/3 of the way from 14 to 20, or 4 away from 14.
The final choice is x > 20, so
x-14 = 2(x-20)
solve that for x.
Or, note that 20 is 6 away from 14, so move away another 6 from 20, and you find that
26 is 12 away from 14 and 6 away from 20.
Clearly x cannot be less than 14, since it will then be closer to 14 than to 20
So, if 14 < x < 20 we have x-20 < 0, so
x-14 = 2(20-x)
x = 18
18 is 4 away from 14 and 2 away from 20
Or, note that since 20 is 6 away from 14, x will be 2/3 of the way from 14 to 20, or 4 away from 14.
The final choice is x > 20, so
x-14 = 2(x-20)
solve that for x.
Or, note that 20 is 6 away from 14, so move away another 6 from 20, and you find that
26 is 12 away from 14 and 6 away from 20.
Answered by
Steve - ahem
17*27 cannot be 468, or any even number!
Answered by
Gayathri
it's 18 and 20 because it is twice as far from 14 as they are from 20.
Answered by
BobtheBuilder
There are two numbers twice as far as 2 as they are far from 14. One number is 10. What is the other number?
Answered by
MaTh PeRsOn
18 and 26
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