Через 3 дня .............................................
<span>4х²+8х-5=0
</span>D = 8²<span> - 4·4·(-5) = 64 + 80 = 144
</span>x1 = (<span><span>-8 - √144)/(</span>2·4)</span> = (<span>-8 - 12)/8</span> = <span>-20/8</span><span> = -2.5
</span>x2 = (<span>-8 + √144)/(2·4)</span> = (-8 +12)/8 = 4/8<span> = 0,5</span>
=-10,28+x+4,3+7,28-4,3=х-3=1 5/11-3=-1 6/11