Question

Tell me If I am right

Find the x and y intercepts

f(x)=-x^2+7x+30

x =(3,10)
y=(0,30)

Answer 1

yeah

Answer 2

Wrong^

Answer 3

ok the y intercept is (0, 3) because if you replace x by 0 you get y = 30

Answer 4

ok the y intercept is (0, 30) because if you replace x by 0 you get y = 30

Answer 5

Your y-int is good.
To find the x-ints (there are two) let y=o and solve for x
-x^2+7x+30=0
x^2-7x-30=0 multi through by -1
(x-10)(x+3)=0 factor
x-10=0 or x+3=0 zero-factor theorem
x=10 or x=-3
points of intersection on x-axis (-3,0) and (10,0)

Answer 6

correct^

Answer 7

the x intercept should look like
\[(a,0)\] and you should have two of them

Answer 8

server is beginning to drive me nuts

Answer 9

i agree!

Answer 10

Shoot, I'm sorry, there I deleted my wrong answer, ^.^

Answer 11

one is right. but you should write
\[(10,0)\] as one of them. the other is not 3, but rather -3, so your answer should look like
\[(10,0), (-3,0)\]

Answer 12

so x is (10,-3)?

Answer 13

NO.

Answer 14

(-3,0) and (10,0)

Answer 15

first coordinate is the x value, second coordinate is 0

Answer 16

there are two intercepts for x

Answer 17

all points on the x-axis have y-coordinate 0