How do you write the equation y=x^2+18x+90 in vertex form?

1 Answer
Mar 17, 2018


y=(x+9)^2+9

Explanation:


By using the completing square method, you can accomplish that.

y=x^2+2(x)(9)+9^2+90-9^2

y=(x+9)^2+90-81

y=(x+9)^2+9

Which is the required vertex form with the vertex at \ \ (-9,9)\ .

That's it!