What is 4x^2+y^2+8x+2y-31=0 ?

The solution to 4x^2+y^2+8x+2y-31=0 is Ellipse with (h,k)=(-1,-1),a=3,b=6

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4x^2+y^2+8x+2y-31=0

4 x^{2} + y^{2} + 8 x + 2 y - 31 = 0

(h, k) = (- 1, - 1), a = 3, b = 6

Solution steps

4 x^{2} + y^{2} + 8 x + 2 y - 31 = 0

Rewrite

4 x^{2} + y^{2} + 8 x + 2 y - 31 = 0

in the form of the standard ellipse equation

\frac{( x - ( - 1 ) ) ^{2}}{3 ^{2}} + \frac{( y - ( - 1 ) ) ^{2}}{6 ^{2}} = 1

Therefore ellipse properties are:

(h, k) = (- 1, - 1), a = 3, b = 6

b > a

therefore

b

is semi-major axis and

a

is semi-minor axis

Ellipse with center (h, k) = (- 1, - 1), b = 6, a = 3

What is 4x^2+y^2+8x+2y-31=0 ?
The solution to 4x^2+y^2+8x+2y-31=0 is Ellipse with (h,k)=(-1,-1),a=3,b=6