Question

What is the value of a for the following circle in general form?

Answer 1

can somebody help me please

Answer 2

well, have you done perfect trinomials yet?
that is expanding something like

\((a + b)^2 \ \ \large ?\)

Answer 3

no i dont know how to do those

Answer 4

do you know the answer?

Answer 5

ahemm, nope, but that's how I'd do it,
the formula of a circle is http://www.mathwarehouse.com/geometry/circle/images/equation-of-circle/general-formula-equation-of-circle.png

Answer 6

so I'd get the (h, k) values from the graphic, and the radius, and plug them into the formula, then expand it and all "a, b, c" coefficients will show up

Answer 7

so, I'd go from "vertex form" to "standard form", which is what you have there

Answer 8

3,-1 h and k r=4

Answer 9

yes, I see that