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secondary 3 | A Maths
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Puay Xin yue
Puay Xin Yue

secondary 3 chevron_right A Maths chevron_right Singapore

I'm not sure how to do part c)

Date Posted: 4 years ago
Views: 251
Kayden Kiew
Kayden Kiew
4 years ago
Take the equation and do a Log to every term.

Lg(10^(2x+1)) +lg(7(10^x))= lg26
(2x+1)lg10+(lg7+lg10^x)=lg26
Lg10=1
2x+1 +lg7+x =lg26
3x+1=lg26-lg17

X=lg A

Sub in

3(lgA)+1=lg26-lg17
Leave 1 as lg 10 again

3lgA +lg10=lg (26/7)

3lgA =lg (26/7)-lg10
Lg(A^3)= lg(26/70)
Remove lg from all

A^3= 26/70

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Eric Nicholas K
Eric Nicholas K's answer
5997 answers (Tutor Details)
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I included the workings for both parts