Question

Could someone helo me? I'm learning about quadratic equations, and I'm not quite sure how to set this problem up to solve.
A= pi r^2 + pi rs

Answer 1

I have to solve for r.

Answer 2

nm, I thought it was set equal to zero..
Do you know quadratic formula?

Answer 3

You can rewrite it in the form, ax^2 +bx +c : a=π, b=sπ, c=-A

Answer 4

okay, I knew i had to plug in a + b = c , not unsure of the direction I needed to go

Answer 5

so would it look like this ?
ax^2 + bx + c =
pi(x)^2 + (pi)sx +(pi)-x^2 ?

Answer 6

Almost.
\[\pi r^2 +s \pi r -A=0.\]

Answer 7

'A' is different from 'a' here.

Answer 8

how do I show the pi symbol when posting on here?

Answer 9

because A is area right?

Answer 10

If you're using a PC, hold down ALT key, press 227 on the numeric keypad then release ALT.

Answer 11

hmm so if I'm using a laptop it's not possible?

Answer 12

Yes, assuming this is some sort of area formula, I'd guess A meant area. There's no context, and it doesn't really matter.
My laptop has a numpad, others that don't usually have some sort of function key that lets you use other keys for the numpad.

Answer 13

If you're using a Macbook or similar, they have their own peculiar codes for symbols. I don't know any of them, but you can look them up online.
Otherwise, you can open the Equation editor here and just type pi and it'll do it.

Answer 14

oh okay, thanks for the tip