Q.3 Find the value of the following expressions, when x = –1:

(i) 2x – 7

(ii) – x + 2

\((iii) x^2 + 2x + 1\)

\((iv) 2x^2 – x – 2\)

(i) 2x – 7

(ii) – x + 2

\((iii) x^2 + 2x + 1\)

\((iv) 2x^2 – x – 2\)

(i) 2x – 7

= (2 × -1) – 7

= – 2 – 7

= – 9

(ii) – x + 2

= – (-1) + 2

= 1 + 2

= 3

\((iii) x^2 + 2x + 1\)

\(= (-1)^2 + (2 × -1) + 1\)

= 1 – 2 + 1

= 0

\((iv) 2x^2 – x – 2\)

\(= (2 × (-1)^2) – (-1) – 2\)

= (2 × 1) + 1 – 2

= 2 + 1 – 2

= 3 – 2

= 1