1) (2х-1)^2<4x+61 4x^2-4x+1-4x-61<0 4(x-5)(x+3)<0 x<5 и x<-3
4x^2-8x-60=0
D=64+960=1024
x1= <u>8+32</u>
8
x1=5
x2=<u>8-32</u>
8
x2=-3
2)-3(х^2+1)<span>≥3х-39 -3x^2-3<span>-</span>3x+39<span>≥</span>0 -3(x+3)(x-4)<span><span>≥</span></span>0 x<span><span>≥</span></span>-3 и х<span><span>≥</span></span>4
</span>
<span><span>-3x^2<span>-</span>3x+36<span>=0</span></span></span>
<span><span><span>D=9+432=441</span></span></span>
<span><span><span>x1=<u>-3+21</u></span></span></span>
<span><span><span> -6</span></span></span>
<span><span><span>x1=-3</span></span></span>
<span><span><span>x2=<u>-3-21</u></span></span></span>
<span><span><span> -6</span></span></span>
<span><span><span>x2=4</span></span></span>