Not sure about "for a bi", but
sqrt(-245) = ± 15.652i where i is the imaginary square root of -1.
245 * 245 = 60025
Complex numbers are numbers of the a + bi where a and b are real number and i is the imaginary square root of -1.
7 root 5
There are infinitely many of them. They include square root of (4.41) square root of (4.42) square root of (4.43) square root of (4.44) square root of (4.45) square root of (5.3) square root of (5.762) square root of (6) square root of (6.1) square root of (6.2)
A principal square root is any square root that's answer is positive, and a perfect square root is a square root that's answer is an integer.
245 245
Expressed as a surd in its simplest form, sqrt(245) is equal to 7 sqrt(5).
√245 = √(49 x 5) = √49 x √5 = 7√5
Imaginary number
Two of the integers are -2 and 5.
sqrt(245) = sqrt(49*5) = sqrt(49)*sqrt(5) = 7*sqrt(5)
[ 0 + 7i ] and [ 0 - 7i ] is.
The standard form of a complex number is a+bi. So the standard form of the negative square root of 5i is 0-√(5i).
245 * 245 = 60025
A number of the form a+bi where a and b are real numbers and i is the square root of -1.
√80 - √245 = √(16*5) - √(49*5) = √16*√5 - √49*√5 = 4√5 - 7√5 = -3*√5
The absolute value of a complex number a+bi is the square root of (a2+b2). For example, the absolute value of 4+9i is the square root of (42 + 92) which is the square root of 97 which is about 9.8489 (The absolute value of a complex number is not complex.)