Question

Use the quadratic formula to find the zeros of the function. Round to tenths if necessary. y = 17x2 - 21

Answer 1

in this question you have a = 17, b = 0 and c = -21

the formula is

\[x=\frac{-b \pm \sqrt{b^4 - 4ac}}{2a}\]

substitute the values and then evaluate to find the zeros

Answer 2

I have tried and always get the wrong answer

Answer 3

what did you get?

Answer 4

1.6 Not sure what im doing wrong

Answer 5

after substituting you should get

\[x =\frac{ 0 \pm \sqrt{0^2 - 4\times17\times-21}}{2\times17}\]

this simplifies to

\[x =\frac{ \pm \sqrt{1428}}{34}\]

which can be simplifed

Answer 6

btw, that should be a b^2 in that radical in your first post...

Answer 7

oops... ty

Answer 8

didn't matter here anyway... :)

Answer 9

would it be 1.1?

Answer 10

yes.... thats the approximation

Answer 11

Awesome!