Question

Using graphing technology, approximate where the graph of y = 3x2 − 11x − 5 crosses the x-axis.

(4.15, 0) and (−0.45, 0)

(4.08, 0) and (−0.41, 0)

(4.02, 0) and (−0.49, 0)

(4.18, 0) and (−0.38, 0)

Answer 1

well geogebra is is a good free graphing package

here is the link

http://www.geogebra.org/webstart/geogebra.html

at the input bar at the bottom of the page type the equation as you have written it in your question.

another alternative is wolfram alpha

http://www.wolframalpha.com/

just type graph and then your equation

Answer 2

it crosses at (4.08,0) and (-.41,0)

when you enter the equation into the y= button of your calculator, (make sure you are in radian mode!) and hit graph, it will give you the graph. then hit the 2nd key then trace and you want to find the zero, because a zero is where the graph crosses the x axis. hope this helps :)

Answer 3

oh and it will also ask for a left boundary and a right boundary and it will guess in the middle of the two points you choose