Question

In the function y=-3x^2+1 , what effect does the negative sign have on the graph, as compared to the graph of y=x^2?

A. It reflects the graph across the x-axis.

B. It shrinks the graph vertically by a factor of 3.

C. It stretches the graph horizontally by a factor of 3.

D. It shrinks the graph horizontally by a factor of 3.

***Idk what it means though.. :/ please explain? thx :)

Answer 1

Think about if you were to plot a value that will be far away from the x-axis, like 3:
y=3(3)^2+1 = 10
but when you put that negative on:
y=-3(3)^2+1 = -8
It will flip (or reflect) every result over the x-axis

Answer 2

ohhh so my answer is A. it reflects the graph across the x axis?

Answer 3

You betcha

Answer 4

haha thanks :) and i understand the explanation too :) thanks @tonks :) and i like ur username :) its like tonks from harry potter!! haha :P

Answer 5

It's also my name, for real

Answer 6

haha cool!! :P