Ax^2+bx+c=a(x-x1)(x-x2)
5x^2-9x-2=0
a=5, b=-9, c=-2
D=b^2-4ac=81+40=121
x1=(-b+кореньD)/(2a)=(9+11)/10=20/10=2
x2=(-b-кореньD)/(2a)=(9-11)/10= -2/10= -0.2
5x^2-9x-2=5(x-2)(x+0.2)=(x-2)(5x+1)
10x²+22x+4=0
a=10, b=22, c=4
D=b^2-4ac=484-160=324
x1=(-b+кореньD)/(2a)=(-22+18)/20=-4/20=-2/10=-0.2
x2=(-b-кореньD)/(2a)=(-22-18)/20= -40/20= - 2
10x²+22x+4=10(x+0.2)(x+2)=2(5x+1)(x+2)
(5x²-9x-2) \ (10x²+22x+4) =(x-2)(5x+1) / 2(5x+1)(x+2) =(x-2)/(2(x+2))