0_0_38281325_29741.cpp: In function 'double f(double)': 0_0_38281325_29741.cpp:12:23: error: 'pow' was not declared in this scope return 6*pow(x,7.0) + 8*pow(x,6.0) + 7*pow(x,3.0) + 5 *pow(x, 2.0) - y * x; ^