Using graphing technology, approximate the solutions of 0.25x2 − 0.46x − 3.1 = 0.

Question

zzr0ck3r · Answer

do you have a ti-89?

anonymous · Answer

What?

anonymous · Answer

The answer choices are

x ≈ −2.72 and x ≈ 4.56

 x ≈ −3.14 and x ≈ 4.24

 x ≈ −2.88 and x ≈ 4.33

 x ≈ −2.61 and x ≈ 4.84

@zzr0ck3r

zzr0ck3r · Answer

what sort of calculator do you have?

zzr0ck3r · Answer

http://www.wolframalpha.com/input/?i=find+the+zeros+of+0.25x%5E2+%E2%88%92+0.46x+%E2%88%92+3.1

anonymous · Answer

Geogebra

anonymous · Answer

@zzr0ck3r

anonymous · Answer

Hi @whpalmer4

anonymous · Answer

Can you help

whpalmer4 · Answer

Don't ask WolframAlpha for the zeros, just have it graph the formula and look at the graph. You can see well enough to pick the right answer choice. http://www.wolframalpha.com/input/?i=0.25x2+%E2%88%92+0.46x+%E2%88%92+3.1+%3D+0

anonymous · Answer

Does geogebra help the same way?

whpalmer4 · Answer

I can't say, I've never used it.  The problem just says "use technology", no?  WolframAlpha certainly qualifies as technology :-)

whpalmer4 · Answer

All you have to do is click on that link I gave you and look at the graph...

campbell_st · Answer

in geogebra just enter 

f(x) = 0.25x^2 - 0.46x - 3.1

you'll get a graph of the curve

then enter 

roots[f, -5, 6]

the command will find the roots of f(x) between -5 and 6

it will show then as points in the algebra window

hope this helps