An integral multiplication and division problem Given x ^ 2 + X-1 = 0. Find the value of x ^ 3 + 2x ^ 2 + 3

An integral multiplication and division problem Given x ^ 2 + X-1 = 0. Find the value of x ^ 3 + 2x ^ 2 + 3

x^2+x-1=0
x^2=1-x
x^3+2x^2+3
=x^2(x+2)+3
=(1-x)(x+2)+3
=-x^2-x+2+3
=-(1-x)-x+5
=4