Answer:
(i) \[2x-7=2(-1)-7=-2-7=-9\]. (ii) \[-x+2=-(-1)+2=1+2=3\] (iii) \[{{x}^{2}}+2x+1={{(-1)}^{2}}+2(-1)+1=1-2+1\] \[=1+1-2=2-2=0.\] (iv) \[2{{x}^{2}}-x-2=2{{(-1)}^{2}}-(-1)-2\] \[=2+1-2=3-2=1.\]
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