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A level 2019 maths Edexcel PAPER 2

X^X! What was that?!? I tried solving it by taking the exponentials of both sides but idk if i found the right answer! Also how did you guys find the paper?

Reply 1

dont know it

Original post by Canes Arslan

X^X! What was that?!? I tried solving it by taking the exponentials of both sides but idk if i found the right answer! Also how did you guys find the paper?

I got x=e^-1 but I don't think that's right.

Reply 2

DynestiGTI

that's right

Original post by dont know it

I got x=e^-1 but I don't think that's right.

Reply 3

Personal_17

Original post by DynestiGTI

that's right

Yayy I got that as well

Reply 4

Plinking

I think it is correct

Original post by dont know it

I got x=e^-1 but I don't think that's right.

Reply 5

Pmk671

How did you get that?

Reply 6

username3250446

I got
f'(x)=x^x

= x^x(1+ lnx)

Reply 7

dont know it

Original post by Pmk671

How did you get that?

y=x^x

ln(y)=xln(x)

Implicitly differentiate: 1/y dy/dx = 1+ln(x)

dy/dx = y(1+ln(x))

0 = x^x (1+ln(x))

1+ln(x)=0

ln(x)=-1

e^ln(x) = e^-1

x=e^-1

Reply 8

Pmk671

Any other answers?