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Which of the following (horizontal) planes is tangent to the surface z=x2+2xy−y2+6x+6y+3z=x2+2xy−y2+6x+6y+3? Select one: a. z=-4...

Which of the following (horizontal) planes is tangent to the surface z=x2+2xy−y2+6x+6y+3z=x2+2xy−y2+6x+6y+3?

Select one:

a. z=-4

b. z=-5

c. z=-8

d. z=-6

e. z=-7

f. z=-3

Math   Calculus   
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