Give the equation of the circle centered at the origin and passing through the point (0,5)

Step-by-step explanation

The standard equation of a circle centered at origin is  

r = radius of the circle

The circle is passing through the point (0,5)

∴ radius  

∴ The equation of the circle is

answer: standard form is ax^2 + bx + c = 0

step-by-step explanation:

standard form is ax^2 + bx + c = 0

(2x + 1)(x - 2) = 0

distribute to get into standard form

2x^2 - 4x + x - 2 = 0

2x^2 - 3x - 2 = 0

a = 2, b= -3, c = -2

a is your answer