0,2(0,04-р)-р²(1-р)=(1-р+0.04-р)(0,2-р²)=(-2р+1,04)(0,2-р²)
X²-7x-18=0
D=49+72= 121
x1=(7+11)/2=9
x2=(7-11)/2= -2
Раскрываем скробки
25x^2+20x+4-(9x^2+30x+25)=0
25x^2+20x+4-9x^2-30x-25=0
16x^2-10x-21=0
D=1444>0
x1=10+38/32=-7/8
x2=10-38/32=3/2
0.1×(−8)^3+0.2×(−8)^2−25=-63,4
0.1×(−8)×3+0.2×(−8)×2−25=-30.6