PAS
jawaban dari no 26-45:
26.
27.
28. f(x)=x^2-2x+9
a=1
b=-2
c=9
nilai min= d/-4a
y=(b^2-4ac)/(-4a)
y= ((-2)^2-4(1)(9))/ (-4(1))
y= -32/-4
y= 8
29. x(log 2) - y(log 3) + z(log 5)=10
2^x-3^y+5^z= 10^10
30.
31.
32. xlog x^2=2
xlog (4x+12)= xlog x^2
berarti:
4x+12= x^2
x^2-4x-12=0
dengan rumus kuadrat didapatkan x=6 atau -2
33.
34. ^2log 48+^5log 50-^2log 3-^5log 2
= ^2log 48-^2log 3+^5log 50-^5log 2
=^2log(48/3) + ^5log ( 50/2)
= ^2log 16 + ^5log 25
= ^2log 2^4 + ^5log 5^2
= 4 ^2log 2 + 2 ^5log 5
= 4(1) + 2 (1)
= 4+2
= 6
35. ^2log 125/9= ^2log 125 - ^2log 9
= ^2log 5^3-^2log 3^2
= 3 x ^2log 5 - 2 x ^2log3
= 3 x 2, 3-2 x 1,6
= 6,9-3,2
= 3,7
36. [2.x-4.3] - [x.1-(-3)(-2)] = [3.5-(-4)(-4)]
[2x-12] - [x-6] = [15-16]
x-6= -1
x= 5
37.
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44.
45.
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