Question

сократить дробь
x^2 + 10x + 21
______________
x^2 + 8x + 15

Answer 1

х^2+10х+21=0
D=b^2-4ac=100-84=16
x1=10-4:2=6:2=3
х2=10+4:2=14:2=7
х^2+8x+15
D=b^2-4ac=64-60=4
x1=8+2:2=5
x2=8-2:2=3
3+7:5+3=10:8=5:4