<span>х²<span>-</span><span>16<span>=</span>0</span></span>
<span>х²</span>=16
х=+-4
ответ:+-4
×300000
0,14
_______
+1200000
300000
__________
15000,00 или 15000
8(x-5)-4(x-2)=12
8x-40-4x+8=12
8x-4x=12+40-8
4x=44
x=44/4
x=11
<span>(х+4)2-(х-2)(х+2)=x^2+8x+16-x^2+4=8x+20</span>
При x=-4
8(-4)+20=-32+20=-8