Question

Choose all of the following equations that have a graph in which the parabola opens downward.
y = 2x2 + 2x + 8
y = -4x2 + 8x - 19
y = 16x2 + 2x - 4
y = -x2 - 6x + 10

Answer 1

For the quadratic question y=ax+bx+c
If a>0, the graph opens upwards.
If a<0, the graph opens downwards.
Can you try to do it now?

Answer 2

* y=ax^2+bx+c

Answer 3

um...

Answer 4

You must look at the number in front of the x^2

Answer 5

For the first equation what number appears in front of the x^2?

Answer 6

2

Answer 7

is that greater than or less than 0?

Answer 8

yes

Answer 9

is 2 greater than or less than 0?

Answer 10

greater

Answer 11

YES!

Answer 12

so it opens up!

Answer 13

what about the next one? what number comes in front of the x^2?

Answer 14

-4

Answer 15

and it is... grater than or less than 0??

Answer 16

less

Answer 17

so its down!!

Answer 18

what about the next two?

Answer 19

greater & less

Answer 20

YEP!

Answer 21

which means...

Answer 22

open & down ?

Answer 23

yep, third one opens up the forth one opens down

Answer 24

see math really isnt THAT hard!

Answer 25

thanks

Answer 26

=) np