You are given an equation of the form

Question

y = ax2 + bx + c.
y = 4x2 + 2x − 3
(a) Use a graphing utility to graph the equation and to estimate the x-intercepts. (Use a zoom-in process to obtain the estimates; keep zooming in until the first three decimal places of the estimate remain the same as you progress to the next step. Enter your answers as a comma-separated list.)
x =_________________

(b) Determine the exact values of the intercepts by using the quadratic formula. Then use a calculator to evaluate the expressions that you obtain. Round off the results to four decimal places. (Check to see that your results are consistent with the estimates in part (a). Enter your answers as a comma-separated list.)
x =_________________________

Answer 1

If you wat to see graph of your function in google type:
function graphs online

When you see list of results click on:

rechneronline.de/function-graphs

When page be open in blue rectacangle type:

4x^2+2x-3

Then click option Draw

You will see graph of your function

Then in google type:
quadratic equation online

When you see list of results click on:

webgraphingcom/quadraticequation_quadraticformula.jsp

When page be open in rectacangle type: 4x^2+2x-3=0
and click option solve it

You will see solution step-by-step

Answer 2

In:
rechneronline.de/function-graphs

if you wat to see zoom of graph in
Display properties set:
Range x-axis from -1.5 to 1.5
Range y-axis from -4 to 1

Answer 3

Hi
I did the same method and got the same answer, but the computer says its the wrong answer. I do not understand why is it wrong? Anyway, thank you very much for your help.

Thanks.