2X - 1 + 2X^2 - X + 4X - 2 = 0
2X^2 + 5X - 3 = 0
D = 25 + 24 = 49 ; √ D = 7
X1 = ( - 5 + 7 ) : 4 = 2/4 = 0,5
X2 = ( - 5 - 7 ) : 4 = - 12/4 = - 3
12х (х-5)^2+13 (х-4)(х+4)=12х (х^2-10х+25)+13 (х^2 -16)=12х^3- 120х^2+300х+13 х^2-208=12х^3-107х^2+300х-208
12h*17m<span>+25mh=204mh+25mh=229mh</span>