# How do I determine the parameter a of the following equation such that f(x, y) has an extremum at a point (x, y) with x = -3, and show that it is a minimum?

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#f(x,y)=ax^2+xy+y^2+x+y+1#

##### 1 Answer

Mar 8, 2018

#### Answer:

See below.

#### Explanation:

Calling

we have

with