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write the standard form equation for the circle whose center is at (0, 0) and that is tangent to the line x + y = 8.

a). x^2 + y^2 - 8 = 0
b). x^2 + y^2 - 32 = 0
c). x^2 + y^2 - 64 = 0

B). x^2 + y^2 - 32 = 0

Step-by-step explanation:

If it is tangent to x+y = 8, then the distance from (h,k) to a point on that line  can be found by using

    d = |A*h+B*k+C| / sqrt(A^2+B^2)

Where Ax + By +c = 0 is the equation of the line and (h,k) is the center of the circle

1x+1y -8 =0

so A =1 B = 1 C = -8

h,k = 0,0

   d = |1*0+1*0+-8| / sqrt(1^2+1^2)

   d = |-8| / sqrt(2)

   d = 8 /sqrt(2)

Multiplying by the sqrt(2)/ sqrt(2) =

    d = 8 /sqrt(2) * sqrt(2)/ sqrt(2)

    d = 8 sqrt(2)/2

   d  =4 sqrt(2)

This is the radius

The standard equation for a circle is in vertex form

(x-h) ^2 + (y-k) ^2 = r^2

(x-0)^2 + (y-k) ^2 = (4 sqrt(2))^2

x^2 + y^2 = 16*2

x^2 + y^2 = 32

Rewriting in standard form

x^2 + y^2 -32 = 32-32

x^2 +y^2 -32 =0

step-by-step explanation:

hello from mrbilldoesmath!

answer:

the domain is the set { -2, 0, 2, 3}

discussion:

the domain is the set of x values in the ordered pairs (x,y). taking the x, or first component, of each ordered pair gives   -2, 0, 2, 3.

you,

mrb