ne1 wanna help another lost youngen (2 Viewers)

[SKA]

does ne 1 know how to solve this equation???

1.3^x=6.9

in steps???

 

[= Jennifer =]

yep...u do the guess and check method

your result should end up being x=7.3651

to get this answer all you do is keep substituting numbers until u get as close to 6.9 as you can

 

[Xayma]

Turn them into logarithms (much quicker). Ie
log 1.3^x=log 6.9
xlog 1.3=log 6.9
x=log 6.9/log1.3
x=7.36198

 

[SKA]

k im still not sure, n u wonder y im doing general math

k just checking
the x is a power to
so its like
1.3 to the power of x = 6.9


n u both got diff answers????


thanks heaps n heaps thou

 

[Xayma]

Originally posted by SKA
k im still not sure, n u wonder y im doing general math

k just checking
the x is a power to
so its like
1.3 to the power of x = 6.9


n u both got diff answers????


thanks heaps n heaps thou

We got different answers cause he was manually checking it to decimal places. Mines more accurate and quicker though.

For mine you need to use logarithm rules. Ie log x^a =a log x

So you get the logarithm of both sides (this changes nothing except expresses them as powers of the base unit).

Then use the logarithm rules to get x log 1.3 (see above logarithm rule) then divide both sides by log 1.3 to get your answer

 

[SKA]

i just read my text book n it says that the 'gues and check' method is the only algebraic skill available for General Maths students.

duz that mean if i do it ur way i will lose marks???

n i typed in my calculator log6.9/1.3 n it equals 1.782160098

but the answer is 7.36199
???

 

[hatty]

general maths students dont do logarithms.

stick with guess and check

 

[SKA]

yeh... that kinda sucks though.. coz it takes too long

 

[...]

Originally posted by hatty
general maths students dont do logarithms.

stick with guess and check

u sure??

cos appaerntly our general maths class in my school learnt log b4 the 2/3u did..haha

 

[Xayma]

Originally posted by SKA
i just read my text book n it says that the 'gues and check' method is the only algebraic skill available for General Maths students.

duz that mean if i do it ur way i will lose marks???

n i typed in my calculator log6.9/1.3 n it equals 1.782160098

but the answer is 7.36199
???

Ok Im not sure if you are allowed to do it, try asking your teacher next year. And the reason you didn't get the right answer is that you needed to divide log 6.9 divided by log 1.3 not just log 6.9/1.3.

 

[hatty]

Originally posted by ...
u sure??

cos appaerntly our general maths class in my school learnt log b4 the 2/3u did..haha

looking thru the general math textbook is has nothing on logs, and i cant find logs n e where in the syllabus.

but if the general students at ur school has done it, than im not 2 sure.

 

[SKA]

Xayma i done
log6.9/log 1.3 n its still giving me the same answer
1.782160098

why does it work for u n not me??

 

[dezzy]

have u turned you calculator around the right way.... jks mat3y

 

[SKA]

Originally posted by dezzy
have u turned you calculator around the right way.... jks mat3y

such a smartasss dezz

 

[= Jennifer =]

remember in the HSC if u do logs in the general paper they will give u zero because u r meant to apply the general maths syllabus not the 2 unit one

 

[SKA]

Originally posted by = Jennifer =
remember in the HSC if u do logs in the general paper they will give u zero because u r meant to apply the general maths syllabus not the 2 unit one

but thats stupid... it wastes too much time!

 

[SKA]

hey just wanted to say i finally got it lol

just wanna thank all u guys heaps n heaps for ur help

jen u the only 1 that taught me the general way n thanks heaps

if u ask me i think the 2u way is so much easier
fanks Xayma .. i gonna ask my teacher if we can use it coz its better. i figured out the reason for me getting that answer n not the rite answer is just sumfing with my calc... i worked it out thou

thanks guys

 

[Xayma]

Originally posted by Ren
hey...you can't use logarithms (although i do agree its much easier n doesnt seem stoopid like "guess the answer"). I did preliminary mathematics and am now doin hsc general maths, n when we were doin this i got told that i couldnt use logarithms, had to use the guess method...even though i had learnt logs and i thought it was easier...pity that.

Well you could always use logarithms on your calculator then "guess" around the number (using whole numbers then halves, etc).

 

[SKA]

Originally posted by Xayma
Well you could always use logarithms on your calculator then "guess" around the number (using whole numbers then halves, etc).

yeh tru that.........awwww im so pissd off

 

[Rahul]

Originally posted by SKA
Xayma i done
log6.9/log 1.3 n its still giving me the same answer
1.782160098

why does it work for u n not me??

it is log6.9/log1.3

use the log method to check your answer, and use the 'guess/check' method for working.