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secondary 3 | A Maths
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I need help with this question. Thank you so much :)
Date Posted: 3 years ago
Views: 181
This one we use a substitution :
let u = log3 (x)
So (log3 (x) )² = 4 log3 (x) becomes :
u² = 4u
Then u² - 4u = 0
u(u - 4) = 0
u = 0 or u - 4 = 0
u = 0 or u = 4
Since u = log3 (x) ,
log3 (x) = 0 or log3 (x) = 4
x = 3^0 or x = 3⁴
x = 1 or x = 81
Edited
let u = log3 (x)
So (log3 (x) )² = 4 log3 (x) becomes :
u² = 4u
Then u² - 4u = 0
u(u - 4) = 0
u = 0 or u - 4 = 0
u = 0 or u = 4
Since u = log3 (x) ,
log3 (x) = 0 or log3 (x) = 4
x = 3^0 or x = 3⁴
x = 1 or x = 81
Edited
Edited
Thank you so much :)
Welcome
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Date Posted:
3 years ago
Thank you so much :)
Thank you :)
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