Question

3x²-24x+21
реш: 3x²-24x+21=0

Answer 1

а=3, в=-24, с=21
Д=в²-4ас=-24²-4*3*21=576-252=324
х= $frac{-b+- sqrt{D} }{2a}$
х1= $frac{24- sqrt{324} } {2*3} = 6:6=1$
x2= $frac{24+ sqrt{324} } {2*3} = 42:6=7$

Answer 2

D=b²-4ac
D=576-252
D=324
x¹=24+√324/6=24+3=27
x²=24-3=21