Question

Using graphing technology, approximate the solutions of 0.72x2-0.18-6.3=0

Answer 1

Are you sure you plugged in the values correctly? My calculator seems to match up with the answer given on wolframalpha.

Answer 2

you need to plot the curve:\[y=0.72x2-0.18x-6.3\]and see where it crosses the x-axes.
the points where it crosses the x-axes will be the solutions to the equation:\[0.72x2-0.18x-6.3=0\]

Answer 3

i got some answers and none were right

Answer 4

what answers did you get?

Answer 5

x= 1.59 and x= -1.34

Answer 6

that would indicate that you haven't drawn the curve correctly.
look at how wolfram has drawn it and compare it with your graph to see where you may have made a mistake: http://www.wolframalpha.com/input/?i=0.72x^2%E2%88%920.18x%E2%88%926.3