Question

Using graphing technology, approximate where the graph of y = 5x2 − 3x − 9 crosses the x-axis.

(1.55, 0) and (−1.15, 0)
(1.23, 0) and (−1.26, 0)
(1.32, 0) and (−1.01, 0)
(1.68, 0) and (−1.08, 0)

Answer 1

you can use wolfram alpha if you don't have a calculator

http://www.wolframalpha.com/input/?i=0+%3D+5x^2+%E2%88%92+3x+%E2%88%92+9

Answer 2

in the part where it says "solutions", click "approximate forms" to get the answers you want

Answer 3

ok, thanks!

Answer 4

yw