Question

does anyone know how to graph y=-2x^2 ?

Answer 1

if you were to replace x with 0, what would the value of y be?

Answer 2

0, right?

Answer 3

yes, so one ordered pair, ie point, on the graph is (0,0)

Answer 4

if x = 1, then y = -2 leading us to another point (1,-2)
if x = 2, then y = -8 leading us to another point (2,-8)
etc etc

you make a table of points and then plot those points. The more points, the more accurate the graph. Once you have all the points plotted, you draw a curve through all of the points

Answer 5

thank you, this helps so much!!

Answer 6

you're welcome

I recommend checking your answer with something like desmos (a free online graphing calculator)

https://www.desmos.com/calculator/

the calculator also allows you to generate a table of points