Question

Find the value D(−1), where D is defined below.D(x)=x2−2x−1

Answer 1

Given:

The expression is given as,

`D(x)=x^2-2x-1`

The objective is to find D(-1).

Step-by-step explanation:

On substituting the value of x = -1 in the given equation,

`D(-1)=(-1)^2-2(-1)-1_{}`

On further solving the above equation,

`\begin{gathered} D(-1)=1+2-1 \\ =3-1 \\ =2 \end{gathered}`

Hence, the value of D(-1) is 2.