tolong kerjakan gan.mksh

No. 5
y=4x-7/3-x
y(3-x)=4x-7
3y-xy=4x-7
4x+xy=3y+7
x(y+4)=3y+7
x=3y+7 / y+4
f^-1(x)=3x+7 / x+4
No. 6
Memotong sb. Y (0,3)
c=3
Titik puncak (2,-2)
x=-b/2a
2=-b/2a
-b=4a
b=-4a
y=ax²+bx+c
-2=4a+2b+3
4a+2b=-5
4a+2(-4a)=-5
4a-8a=-5
-4a=-5
a=5/4
b=-4.5/4=-5
y=5/4x²-5x+3
No. 7
x²+3x-28=0
(x+7)(x-4)=0
x=-7 atau x=4
x1=-7
x2=4
3x1+2x2=3.(-7)+2.4=-21+8=-13