How do you find all the real and complex roots of x^2 - 20 = 0x220=0?

1 Answer
Jan 10, 2016

roots are real x = ±2sqrt5 x=±25
There are no complex roots

Explanation:

x^2 - 20 = 0 rArr x^2 = 20 rArr x = ±sqrt20 x220=0x2=20x=±20

now sqrt20 = sqrt(4 xx 5 ) = 2 sqrt5 20=4×5=25