<span>-2(х-3)=-3(х+7)
-2х+6=-3х-21
-2х+3х=-21-6
х=-27
Ответ:-27 </span>
1.х(5х-4)
х=0
5х-4=0
х=4/5
2.D=b^2-4ac
D=9-4*1*(-10)=49
x1=-3+7/2=2
x2=-3-7/2=-5
3.D=64-4*5*3=64-4*15=4
x1=8+2/10=1
x2=8-2/10=0,6
4.x^2+2x+1=7918-2x
x^2+4x-7917=0
D=16-4*1*(-7917)=16+31668=31684
x1=-4+178/2=87
x2=-4-178/2=-91
Cos²A=1:(1+tg²A)=1:(1+6/144)=1:150/144=144/150
sinA=√(1-cos²A)=√(1-144/150)=√(6/150)=√1/25=1/5
=х²-10х+25+10х=х²+5²...........