Question

Jawaab yg serius yaa , mohon bantuannya

Answer 1

7) b = a^4
a' log b - b' log a
= a' log a^4  - (a^4)' log a
= 4 (a' log a) - a' log a^(1/4)
= 4(1) - 1/4 (a' log a)
= 4 - 1/4(1)
= 4 - 1/4
= 15/4

8) jika a'logb=4 dan c'logb = 4, maka a = c
dg demikian nilai dari :
[a' log (bc)^4]^(1/2
= [4 (a' log(bc) ]^(1/2)
= 4^1/2  * [a' log (bc)]^(1/2)
= 2 [a'logb + a'logc]^(1/2
= 2 [4 + a'loga]^(1/2)
= 2 [4+1]^1/2
= 2 (5^1/2)
= 2√5