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`

Explanation

Given that, `x=-1`

(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`

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