For all real numbers a, b, and c: if a=b, then a + c = b + c. this is the of equality.

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225

the formula for the equation of a circle is (x – h)2+ (y – k)2 = r2, where (h, k) represents the coordinates of the center of the circle, and r represents the radius of the circle. if a circle is tangent to the x-axis at (3,0), this means it touches the x-axis at that point.