Question

What is the equation, in standard form, of a parabola that models the values in the table?

Answer 1

x -2 , 0 , 4
f(x) -7 , 3 , -73

Answer 2

A. y = -3x^2 - 4x + 3
B. y = -4x^2 - 3x + 3
C. y = -3x^2 - 3x + 4
D. y = 4x^2 + 3x - 3

Answer 3

@ranga @ranga @ranga @ranga @ranga

Answer 4

When x = 0, f(x) = 3. Try that in each of the answer choices and you can quickly rule out two of the answers. Then, of the remaining two choices, try x = -2 and see which one gives you -7.

Answer 5

How does that rule out 2 choices. which 2 choices are you talking about ?

Answer 6

B and D are eliminated ?

Answer 7

When x = 0,
A: gives 3
B: gives 3
C gives 4
D gives -3

Only the first two gives 3. The last two choices don't give 3 and so they are out.

Answer 8

Okay C amd D are eliminated

Answer 9

Yes. Put x = -2 in the first two choices and see which one gives -7.

Answer 10

neither one i got 23 and 25

Answer 11

@ranga

Answer 12

A. y = -3x^2 - 4x + 3
x = -2
y = -3(-2)^2 - 4(-2) + 3 = -3(4) + 8 + 3 = -12 + 11 = -1

B. y = -4x^2 - 3x + 3
x = -2
y = -4(-2)^2 - 3(-2) + 3 = -4(4) + 6 + 3 = -16 + 9 = -7

Answer 13

okay B is the answer .. lol ^_^

Answer 14

Okay and one more quick question here ...

Answer 15

\[\sqrt{-144}\] Is that 12i or 144i ?

Answer 16

12i

Answer 17

Okay thanks again

Answer 18

You are welcome.