3·10³+2·10²+5·10¹=3000+200+50=3250
<span>1) x2+7x+10=0
2x+7x+10=0
9x+10=0
9x=-10
x=(-10)</span>÷9
x=-10/9
<span>2) -x2+8x-52=0
</span>-2x+8x-52=0
6x-52=0
6x=52
x=52÷6
x=26/3
<span>3) -x2-4x-3=0
</span>-2x-4x-3=0
-6x-3=0
-6x=3
6x=-3
x=(-3)÷6
x=-1/2
<span>4) -x2-14-50=0
</span>x=-32
<span>5) x2-12x+29=0
</span>x=29/10
<span>6) -x2+4x+5=0
x=-5/2
</span><span>7) -x2+8x-9=0
x=3/2
</span><span>8) x2-4x-2=0
x=-1
</span><span>9) x2+3x-4=0
x=4/5
</span><span>10) x2-14x+49=0
x=49/12
</span><span>11) x2+4x+20=0
x=-10/3</span>
Раскрываем скобки
x^2 + x - 7x - 7 = x^2 - 6x - 7