(4у³+15у)-(17у-у³)=4у³+15у-17у+у³=5у³-2у=у(5у²-2)
4x^2-8x=0
4x(x-4)=0
4x=0 или x-4=0
x=0 или x=4
ответ:0 и 4
X² +y² +10x +6y +34 =0⇔(x+5)² +(y+3)² =0⇒ { x+5 =0 ; y+3 =0.⇔{ x= - 5 ; y = - 3 .
* * *x² +y² +10x +6y +34 =x² +10x +y²+6y +34 = x² +2*x*5+5² +y² +2*y *3+3² =
(x+5)² +(y+3)² . * * *
(-х)3=-3х
-(-х)3=-3х
-(-х3)=х3
0,49^ (-1/2) = (49/100)^(-1/2) = (100/49)^(1/2) = √100/49 = 10/7