Question

√x+5=x-7 (x+5 под корнем)

Answer 1

Х+5=х^2-14х+49
Х+5-х^2+14х-49=0
15х-44-х^2=0
-х^2+15х-44=0
Х^2-15х+44=0
D=b^2-4a*c
D=-15^2-4*1*44=49
X1=15+7/2=11
X2=15-7/2=4