-х²-4х+45=0
х²+4х-45=0
D=16-4*(-45)=16+180=196=14²
х1=(-4+14)/2=5
х2=(-4-14)/2=-9
<span>1.(a+7)(a-7)=а</span>²-49<span>
2.(6+x)(6-x)=36-х</span>²<span>
3.(4b-1)(4b+1)=16b</span>²-1<span>
4.(8m+3y)(3y-8m)=9y</span>²-64m²<span>
5.(x^7 -q^5)(x^7+q^5)=x^14-q^10
6.(7a²y³- 1|5ay²)(7a²y³+1|5ay²)=49a^4y^6-1/25a^2y^4</span>
(4/3)^2x-2(4/3)^x-3<=0
t=(4/3)^x
t^2-2t-3<=0
[-1;3]
(4/3)^x<3
x<=lg3/(lg4-lg3)
Вот верный ответ,ответ от "Свой" неверный