f(x)=\left\{\begin{array}\ x+5  & \mbox{ si }& x\leq-1\x^2-2x & \mbox{si}& x>-1}\end{array}

f = If(x ≤ -1.0, x + 5.0, x^(2.0) - 2.0 * x)
P: (-1.0 * 1.0, f(-1.0 * 1.0))
E1 = 0