Question

log1/2 (x^2-4x+20)=-5

Answer 1

log1/2 (x^2-4x+20)=-5
log1/2 (x^2-4x+20)=log1/2 32
x^2-4x+20=32
x^2-4x-12=0
D=16-4*(-12)=64
x1=(4+6)/2=5
x2=(4-6)/2=-1