Find the directions in the xy-plane in which the function f left parenthesis x comma y right parenthesisequals15 minus 2 x squared minus 4 y squared has zero change at the point pleft parenthesis negative 2 comma negative 1 comma negative 9 right parenthesis. express the directions in terms of unit vectors.

x =±sqrt(1/3)

step-by-step explanation:

x+4/6x=1/x

multiply each side by 6x to get rid of the fractions

6x*(x+4/6x)=1/x*6x

distribute

6x^2 +4 = 6

subtract 4 from each side

6x^2 +4-4 = 6-4

6x^2 =2

divide by 6

6x^2/6 = 2/6

x^2 = 1/3

take the square root of each side

sqrt(x^2) = ±sqrt(1/3)

x =±sqrt(1/3)

answer: 12

step-by-step explanation:

because yes

answer: 3.26019516

step-by-step explanation: