Question

log12(x²+4-5)=-4
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Answer 1

x^2+4x-5=(1/2)^(-4)
x^2+4x-5=16
x^2+4x-21=0;    D1=4+21=25=5^2;  x1=(-2-5)=-7;  x2=-2+5=3
49-28-5=16>0
9+12-5=16 Ответ-7; 3