式7: left parenthesis, "x" plus 4 , right parenthesis left parenthesis, "x" plus 6 , right parenthesis equals 2 "x" squaredx+4x+6=2x2
7
式8: "x" squared plus 10 "x" plus 24 equals 2 "x" squaredx2+10x+24=2x2
8
式9: "f" left parenthesis, "x" , right parenthesis equals "x" squared minus 10 "x" minus 24fx=x2−10x−24
9
式10: "x" Subscript, 1 , Baseline equals StartFraction, 10 plus StartRoot, left parenthesis, negative 10 , right parenthesis squared minus 4 times 1 times left parenthesis, negative 24 , right parenthesis , EndRoot Over 2 times 1 , EndFractionx1=10+−102−4·1·−242·1
equals=
1212
10
式11: "x" Subscript, 2 , Baseline equals StartFraction, 10 minus StartRoot, left parenthesis, negative 10 , right parenthesis squared minus 4 times 1 times left parenthesis, negative 24 , right parenthesis , EndRoot Over 2 times 1 , EndFractionx2=10−−102−4·1·−242·1