if y=x^3 +2x+5 and z= x^2 + 7x+1, what is 2y+z in terms of x?
2x^3 + x^2 + 11x +11
Substituting the expressions equivalent to y and z into 2y +z results in the expression
2(x^3 +2x +5) +x^2+ 7x +1. The student must apply the distributive property to multiply
x^3 +2x +5 by 2
and then combine the like terms in the expression.