8x^2 + x - 9 = 0
D = 1 + 4*9*8 = 17^2
x1 = ( - 1 + 17)/16 = 1;
x2 = ( - 1 - 17)/16 = - 9/8
8x^2 + x - 9 = 8(x + 9/8) (x - 1) = (8x + 9) (x - 1)
15х-у-2-14х=х-у-2 х=-16; у=-4
-16+4-2=-14
=∛27+∛135=3+∛27*5=3+3∛5
=∛(10-√73)(10+√73)=∛10²-(√73)²=∛100-73=∛27=3