bantuin plissss........

1.D
(x-2)^x²-x-2 =1
(x-2)^x²-x-2 = (x-2)^0
x²-x-2=0
(x-2)(x+1)=0
x=2 atau x=-1
(x-2)^0=1
x-2=1
x=3
2.E
2^x²-7x+7=5^x²-7x+7
x²-7x+7=0 (ax²+bx+c)
x1+x2=-b/a
=-(-7)/1
=7
4.misal 3^x=y
(3^x)²-5.3^x-36=0
y²-5y-36=0
(y-9)(y+4)=0
y=9 atau y=-4
3^x=9
3^x=3²
x=2
Yg -4 tidak memenuhi
HP={2} (yg D)