tolong jawab 3 sampai 4

no.3

5log9.3log10-5log4

=2.5log3.3log10-5log4
=2.5log10-5log4
=5log100-5log4
=5log25
=2 (B) (ini aku yakin tenanan lho :v)

no.4

(f o g) = f(g(x))

f(x+2)=x^2+5x-15

=(x+2)^2+5(x+2)-15
=(x^2+4x+4)+(5x+10)-15
=x^2+9x-1 (B) (ini juga yakin bener lhooo)