Дискриминант
1. D=37
2. D=24
Разложение:
1. х(х-4)-21 = (х-21)(х-4)
2. 3х(-х+4)+15 = 3(х+15)(-х+4)
3. х(х+3)-10 = (х-10)(х+3)
4. 2х(х²-1)+24 = 2(х+12)(х-1)(х+1)
Дискриминант:
1. D= (-3) ² - 4 * 1 * (-7) = 9 + 28 = 37
2. D= 2 ² - 4 * (-1) * 5 = 4 + 20 = 24
Разложение :
1) x²-4x-21 = х(х-4)-21 = (х-21)(х-4)
2)-3x²+12x+15 = 3х(-х+4)+15 = 3(х+15)(-х+4)
3) x²+3x-10 = х(х+3)-10 = (х-10)(х+3)
4) -2x³-2x+24 = 2х(х²-1)+24 = 2(х+12)(х-1)(х+1)