C2 log question Watch

Kathrin
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#1
Report Thread starter 12 years ago
#1
Heya!

I am stuck on that log question:

Solve these:
5^2x - 6x5^x + 5 = 0

Thx for any help

Kathrin
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insparato
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#2
Report 12 years ago
#2
5^2x - 6x5^x + 5 = 0

let y = 5x

y2 -6y + 5 = 0

(y - 1 )(y - 5)

y = 1 y = 5

5x = 1
5x = 5

xlog 5 = log 1

x = log 1/log 5 = 0

xlog5 = log 5

x = log 5/log 5 = 1
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Kathrin
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#3
Report Thread starter 12 years ago
#3
Cheers mate :gthumb:
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Coolraj
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#4
Report 12 years ago
#4
precisely! by the way insparato, have you been online for the whole day? that is an achievement man...
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insparato
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#5
Report 12 years ago
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haha yes i have been on since 8am till now. Ive just been sitting here with my laptop with my RSS feeds doing my own papers and if anyone needs help on TSR i appear like superman and save their maths day!
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