Question

X^2-x-20=0 solve quadratic formola

Answer 1

Answer:

x2-x-20=0

D=b2-4ac

a=1. b=-1. c=-20

D=b2-4ac

=(-1)2-4(1)(-20)

=1+80=81

x =-b+_✓D/2a

=-(-1)+_✓81/2

=-1+_9/2

x =-1+9/2 and x =-1-9/2

x=8/2=4 and x =-10/2=-5