What is the vertex form of $y=9x^2 - 17x - 85$ ?

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Answer 1 · 2017-06-08T20:50:24

For the method in detail have a look at:
https://socratic.org/s/aFpc6GYR

$y=9(x-17/18)^2-3349/36$

$y=9(x-17/(2xx9))^2+k-85$

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Note that $" "9(-17/(2xx9))^2+k=0$

$=>17^2/36+k=0$

$=>k=-289/36 =-8 1/36$
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$y=9(x-17/(2xx9))^2-8 1/36-85$

$y=9(x-17/18)^2-3349/36$

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What is the vertex form of y=9x^2 - 17x - 85 y=9x^2 - 17x - 85 ?