(10-x)^2+(x+10)(10-x)

Question

(10-x)^2+(x+10)(10-x)<0

Answer 1

(10-x)^2+(x+10)(10-x)<0,</p>

вынести за скобки (10-х),

(10-х)(10-х+х+10)<0,</p>

(10-х)20<0,</p>

10-х<0,</p>

-х<-10,</p>

х>10

х€(10; +беск)

Answer 2

(10-x)^2+(x+10)(10-x)<0</p>

100-20x+x^2+(10+x)(10-x)<0</p>

100-20x+x^2+100-x^2<0</p>

200-20x<0</p>

-20x<-200</p>

x>10