Question

Are the following points on the graph of f(x)=3x^2 + 7x -8 (-3,-2) (-1, -10) (1,2) (3, 45)

Answer 1

for the first point (-1,-10) if you replace x by -1 and get -10 the point is on the graph

Answer 2

it's not the first point, but anyway..

Answer 3

how can you test and see if the points are on the line

Answer 4

f(-1) = 3(-1)^2+7(-1)-8
f(-1) = 3-7-8
f(-1) = -12 the point (-1,-10) is not on the graph

Answer 5

let's say you have the point (a,b)
you know the point is on the line if f(a)=b

Answer 6

the values must satisfy the equation

Answer 7

even if they are points...ex. (5, -2)

Answer 8

any point, you substitute x and calculate y, if they match then the point is on the line

Answer 9

try the point (-3,-2)
what is f(-3)?

Answer 10

if plugged into the equation i originally provided ( f(x) = 3x^2 +7x -8... then it would be -2

Answer 11

ohhhh

Answer 12

this means the point (-3,-2) is on the line of this function

Answer 13

THANK YOU SO MUCH! you really helped me put that into perspective without completely giving me the answer! thank you!