Question

I fan and give medals I just need someone to check my answer:)
Write a quadratic variation equation if g(x) varies directly with x2, and g(x) = 98 when x = 7.
A.g(x) = 2x2
B.g(x) = ½x2
C.g(x) = 7x2
D.g(x) = 14x2
I think its C. but I may be wrong:)

Answer 1

Umm, no. Again, use the old approach.

Answer 2

In layman's language, all the options are pretty much same, but it is the number next to x^2 that differs.

Answer 3

SO then its D.?

Answer 4

because you x^2?

Answer 5

And we can find it as well!

Let's say that the number next to x^2 is c. Then we have the equation f(x) = cx^2. What does this become when x = 7? Just replace x with 7.

Answer 6

49?

Answer 7

@ParthKohli

Answer 8

Yeah, and the left side is given as 98.

98 = 49 * c

Solve for c

Answer 9

divide each side by 49?

Answer 10

@ParthKohli

Answer 11

Yes!

Answer 12

so 98=c?

Answer 13

No no... 98/49 = c

Answer 14

oh ok

Answer 15

so then the answer is a?

Answer 16

98/49 = 2

Answer 17

What do you think?

Answer 18

yes thanks again for everything!