Given that 4y^2+9x^2+16y+18x=k is an ellipse equation. Find the value of k.

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(9x^2 +18x) +(4y^2+16y)=k... 9(x^2 +2x) +4(y^2 +4y)=k... 9(x^2 +2x+1) +4(y^2+4y+2)=k+9+8... 9(x+1)^2 +4(y+2)^2=k+17... or k=9(x+1)^2 +4(y+2)^2 -17
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Cannot find the exact value of k?
by Level 1 User (220 points)

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