O-Level Additional Math

[elkniwt]

Hello,


Helping my niece ask this qn:

Find an expression f(x) such that d/dx [f(x)] = 1/(xlnx)

Thanks for help.

[jieheng]

elkniwt:

Hello,


Helping my niece ask this qn:

Find an expression f(x) such that d/dx [f(x)] = 1/(xlnx)

Thanks for help.

d/dx [f(x)] = 1/(xlnx)

= (1/x ) / (ln x)

f(x) = ln (ln x) + c (Ans)

[Acsian]

hello can i get help for the following algebra question…


(m+2)/3 + 2(m-5)/4

Sorry new to algebra solved untill 10m-22 / 12 stuck after it

[jieheng]

Acsian:

hello can i get help for the following algebra question......


(m+2)/3 + 2(m-5)/4

Sorry new to algebra solved untill 10m-22 / 12 stuck after it

(m+2)/3 + 2(m-5)/4

= [(m+2)*4]/(3*4) + [2(m-5)*3]/(4*3)

= [ (4m+8)+ (6m-30) ] / 12

= (10m-22) / 12

= (5m-11) / 6 (Ans)

[Acsian]

jieheng:

Acsian:

hello can i get help for the following algebra question......


(m+2)/3 + 2(m-5)/4

Sorry new to algebra solved untill 10m-22 / 12 stuck after it

(m+2)/3 + 2(m-5)/4

= [(m+2)*4]/(3*4) + [2(m-5)*3]/(4*3)

= [ (4m+8)+ (6m-30) ] / 12

= (10m-22) / 12

= (5m-11) / 6 (Ans)

actually the answer in my math handbook is 5m-5/6 and i typed the equation wrongly :oops:

correct equation

(m+2)/3 + 2(m-5)/4 +1

[jieheng]

Acsian:

jieheng:

[quote=\"Acsian\"]hello can i get help for the following algebra question......


(m+2)/3 + 2(m-5)/4

Sorry new to algebra solved untill 10m-22 / 12 stuck after it

(m+2)/3 + 2(m-5)/4

= [(m+2)*4]/(3*4) + [2(m-5)*3]/(4*3)

= [ (4m+8)+ (6m-30) ] / 12

= (10m-22) / 12

= (5m-11) / 6 (Ans)

actually the answer in my math handbook is 5m-5/6 and i typed the equation wrongly :oops:

correct equation

(m+2)/3 + 2(m-5)/4 +1[/quote]
(m+2)/3 + 2(m-5)/4 +1

=[ (10m-22) / 12 ] + 12/12

= (10m-22+12) / 12

= (10m-10) / 12

= (5m-5) / 6 (Ans)

[Acsian]

jieheng:

Acsian:

[quote=\"jieheng\"]


(m+2)/3 + 2(m-5)/4

= [(m+2)*4]/(3*4) + [2(m-5)*3]/(4*3)

= [ (4m+8)+ (6m-30) ] / 12

= (10m-22) / 12

= (5m-11) / 6 (Ans)

actually the answer in my math handbook is 5m-5/6 and i typed the equation wrongly :oops:

correct equation

(m+2)/3 + 2(m-5)/4 +1

(m+2)/3 + 2(m-5)/4 +1

=[ (10m-22) / 12 ] + 12/12

= (10m-22+12) / 12

= (10m-10) / 12

= (5m-5) / 6 (Ans)[/quote]
Thanks Alot jieheng Thanks :thankyou:

[jieheng]

Acsian:

Thanks Alot jieheng Thanks :thankyou:

Hi Acsian ,

You are welcome.

Regards,

[Herbie]

When to use HCF and LCM to solve problem qn? Can someone advise?

[Acsian]

when


10x^2+40xy-24x-96y is factorised the answer is (2x+8y)(5x-12) *not fully factorised*


But when 2ax-4ay+3bx-6by is factorised, why is the answer is
(2ab-3b)(x-2y)and not

(2ab+3b)(x-2y)

please help[/b]