<span>1)x^2+24x+44=x</span>²<span>+2*12x+144-100=(x+12)</span>²<span>-10</span>²<span>=(x+12-10)(x+12+10)=
(x+2)(x+22)
2)х^2-17x+70=x</span>²-10x-7x+70)=x(x-7)-10(x-7)=(x-7)(x-10)
<span>
3)x^2-40x+351=x</span>²-2*20x+400-49=(x-20)²-7²=(x-20-7)(x-20+7)=
<span>(x-27)(x-13)
4)x^2+4x-60=x</span>²+10x-6x-60=x(x+10)-6(x+10)=(x+10)(x-6)
A=2z² +11z
a² - 23a +126=0
D=23² - 4*126=529 - 504=25
a₁=(23-5)/2=9
a₂=(23+5)/2=14
При a=9
2z² +11z=9
2z² +11z-9=0
D=121+72=193
z₁=
z₂=
При а=14
2z²+11z=14
2z²+11z-14=0
D=121+112=233
z₁=
z₂=