Question

need help again. man im not doing so well today.. f(x)= -x^2-9x-20.25
what are the x-intercepts. i have to show step by step

Answer 1

Set it equal to zero and solve using complete the square or quadratic formula. If it makes it easier, you can divide it all by -1.

Answer 2

You can rewrite the equation as:
\(\Large \color{MidnightBlue}{\Rightarrow y = -x^2 - 9x - 20.25 }\)
Get the y-intercept by setting x = 0
x-intercept by setting y = 0.

Answer 3

QF again... becareful...:)

Answer 4

Hmm?

Answer 5

uh quick fox, quiz friday, quack funny, quadratic formula ... take your pick parth....

Answer 6

Quarantined Foreigners

Answer 7

\(\Large \color{MidnightBlue}{\Rightarrow y = x^2 + 9x + 20.25 }\)
Since we have y = 0,
\(\Large \color{MidnightBlue}{\Rightarrow x^2+ 9x + 20.25 = 0 }\)

Answer 8

lol ^^^

Answer 9

I like the formula :P

Answer 10

\(\Large \color{MidnightBlue}{\Rightarrow x = {-b \pm \sqrt{b^2 - 4ac} \over 2a} }\)

Answer 11

i did the quadratic formula
and still didnt get the answers like in the book.

Answer 12

i am bad at calculating

Answer 13

You can do factoring then, if the formula is too tedious.