25x²-(4x-1)²= (5x-4x+1)*(5x+4x-1)= (x+1)*(9x-1)
1)(с+2)(с-3) - (с-1)^2=c²-3c+2c-6-c²+2c-1=c-7
<span>2)x/4 - x/3 = -1
</span> 3x-4x=-12
-x=-12
x=12
3) 5х+10>-1
<span>5х+10+1>0
</span> 5x+11>0
5x>-11
x>-2.2
x<em> </em><span>∈ [-2.2;<span>+∞).
</span>4)<span>y=4х-х^2
4х-х^2=0
x(4-x)=0
x=0 и 4-x=0
x=4
ответ: x=0;x=4 .</span></span>
Х²-7х+10=х²-2х-5х+10=х(х-2)-5(х-2)=(х-5)(х-2).
3х²-5х-2=3х²+х-6х-2=х(3х+1)-2(3х+1)=(х-2)(3х+1).