Question

Find the value of the polynomial x2-x-1 at x=-1

Answer 1

Question ➡

Find the value of the polynomial x^2-x-1 at x=-1

Answer ➡

${x}^{2} - x - 1 \\ \\ (substitute \: - 1 \: in \: place \: of \: x) \\ \\ ( { - 1}^{2} ) - ( - 1) - 1 \\ \\ 1 + 1 - 1 \\ \\ 2 - 1 \\ \\ = 1$

Therefore value of the polynomial is 1

Answer 2

The value of the expression is 1 at x=-1.

Step-by-step explanation:

Given : Polynomial $x^2-x-1$ at x=-1.

To find : The value of polynomial ?

Solution :

The polynomial is $P(x)=x^2-x-1$

Substitute the value x=-1,

$P(-1)=(-1)^2-(-1)-1$

$P(-1)=1+1-1$

$P(-1)=1$

Therefore, the value of the expression is 1 at x=-1.

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