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<span>система:</span>
<span>0=a+b+c</span>
<span>0= 9a+3b+c</span>
<span>3=c</span>
<span> </span>
<span>a+b= -3</span>
<span>a= -3-b</span>
<span>9*(-3-b)+3b+3=0</span>
<span>-27-9b+3b+3=0</span>
<span>-6b=-24</span>
<span>b= 4</span>
<span>a=-7</span>
<span> </span>
<span>y=-7x^2+4x+3</span>
<span> </span>
<span>2)</span>
<span>система</span>
<span>0=9a-3b+c</span>
<span>0=a+b+c</span>
<span>6=c</span>
<span> </span>
<span>a+b=-6</span>
<span>a=-6-b</span>
<span>9(-6-b)-3b-6=0</span>
<span>-54-9b-3b-6=0</span>
<span>-12b=-60</span>
<span>b=5</span>
<span>a=-11</span>
<span> </span>
<span>y= -11x^2+5x+6</span>
Для того что бы найти пересечение надо их приравнять
-3х²= -27
х²=9
х= 3 и х= -3