Question

What are the x-intercepts for the graph of y=3(x-1)(x+6)?

A. (-1,0) and (6,0)

B. (1,0) and (-6,0)

C. (0,-1) and (0,6)

D. (0,1) and (0,-6)

***Idk how to solve.. please explain? thanks ;)

Answer 1

x intercepts are zeros of the functions. Now, for which values of x will y be 0?

Answer 2

idk :(

Answer 3

umm -1 and 6?? idk :/

Answer 4

no, if you inserted -1, how much would you get? 6 is correct

Answer 5

uh no, sorry

Answer 6

-6 would be correct

Answer 7

-1 as x?

Answer 8

yes, how much would y be if x=-1

Answer 9

\[0=6(x-1)(x+6)\]
whats the solution

Answer 10

y=3(x-1)(x+6)
y=3(-1-1)(-1+6)
y=3(-2)(5)
y=3(-10)
y=-30
??? is that right?? idk

Answer 11

yes, so -1 cannot be correct, you want y to be 0

Answer 12

@Jonask
0=6(-1-1)(-1+6)
0=6(-2)(5)
0=6(-10)
0=30
wait so what just happened there?

Answer 13

@Rimplestorck so now C and D are out right???
so we need to consider between answer choices A and B?

Answer 14

Wow, such confusion

Answer 15

the y coordinates of x intercepts are 0, so yes, C and D are out

Answer 16

haha yeah :/ @hero.. :P

Answer 17

and how do we find the answer then?

Answer 18

well you just need to find values of x for which 0=6(x−1)(x+6) is 0

Answer 19

for example, let's take x-1 first

Answer 20

what does x have to be for x-1 to be 0

Answer 21

it has to be 1

Answer 22

ok

Answer 23

and for x+6 to be 0, x has to be?

Answer 24

ohhh i see now.. it has to be -6
so my answer is B. (1,0) and (-6,0)
????

Answer 25

yes indeed

Answer 26

yes

Answer 27

awesome!! thanks :) @Rimplestorck can u pls give @Jonask a medal for me?? i can only give one :/ thanks for the help!! :D

Answer 28

i a;lready gave hero

Answer 29

okay its all good then :) thanks tho :)