Expression 8: "f" Subscript, 1 , Baseline left parenthesis, "x" , right parenthesis equals "a" Subscript, 1 , Baseline "x" squared plus "b" Subscript, 1 , Baseline "x" plus "c" Subscript, 1 , Baselinef1x=a1x2+b1x+c1
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Expression 9: "f" Subscript, 2 , Baseline left parenthesis, "x" , right parenthesis equals "a" Subscript, 2 , Baseline "x" squared plus "b" Subscript, 2 , Baseline "x" plus "c" Subscript, 2 , Baselinef2x=a2x2+b2x+c2
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Expression 10: "g" left parenthesis, "x" , right parenthesis equals "f" Subscript, 1 , Baseline left parenthesis, "x" , right parenthesis squared plus "f" Subscript, 2 , Baseline left parenthesis, "x" , right parenthesis squaredgx=f1x2+f2x2