Question

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

Answer 1

A.) (0,1) and (0,-6)
B.) (1,0) and (-6,0)
C.) (-1,0) and (6,0)
D.) (0,-1) and (0,6)

Answer 2

y=3(x+1)(x-6) when the line intercepts x, y=0
therefore 3(x+1)(x-6)=0
expand the eqn, we have 3x^2-15x-18=0
we have x=6 and x=-1

Answer 3

expand?

Answer 4

do we plug in the answer choices in to the equation to see if they equal each other?

Answer 5

yeah that's how you check to see if your answer is correct.

Answer 6

\[3(x+1)(x-6)=0\iff x+1=0,x-6=0\]

Answer 7

so what would you the answer could be so i i just plugin -1and 6?

Answer 8

the answer would be 0 if you plug in the right ans

Answer 9

so it has to be equal to 0for it to be correct?

Answer 10

yah

Answer 11

thanks :D