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Not the right answer

I do not see the right answer when i use this function.

float comppoly(x)
{ float y1,y2;
float a1=0.1,b1=0.3,a2=2.1,b2=5.3,c=0.22;
y1=a1*x+b1;
y2=a1*x^2+b2*x+c;
return(y2>y1);};

?can you say what is wrong?