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Ask experts to answer the following math questions for me!
1.f(x,y)=x? -Really? +3x? +3y? -9x

fx=3x? +6x-9=3(x? +2x-3)=3(x+3)(x- 1)=0

x 1=-3,x2= 1

fy=-3y? +6y=-3y(y-2)=0

y 1=0,y2=2

The stagnation point is (-3,0) (10) (-3,2) (12).

fxx=6x+6=A,fxy=0=B,fyy=-6y+6=C

1.(-3,0)

AC-B? & lt Zero Infinite Value

2.(-3,2)AC-B? & gt0 has extreme value.

3.( 1,0)

AC-B? = 72>0 has extreme value.

4.( 1,2)

AC-B? =-72 & lt; Zero infinite value

therefore

Choose advertising

2. BC

3. alternating current

4. Bachelor of Science

5. BC

6.B

7.B

8.B

9.B

10.B