4x+y=34⇒y=34-4x
2x²+xy-2y²=136
2x²+34x-4x²-2312+544x-32x²-136=0
34x²-578x+2448=0
x²-17x+72=0
x1+x2=17 U x1*x2=72
x1=8⇒y1=34-32=2
x2=9⇒y2=34-36=-2
(8;2);(9;-2)
1) 21а^2b + 28ab^2 = 7ab(3a + 4b)
2) 4a^2 - 8a^3 + 12a^4 = 4a^2(1-2a+3a^2)
3) a^5 + a^2 = a^2(a^3 + 1)
= х³+у³-х³-ху²=у³-ху²=у²(у-х)