Find the values of the following expressions when x=-1:

(i) 2x - 7


(ii) -x + 2


(iii) x2 + 2x +1


(iv) 2x2- x -2


(i) 2x - 7


Put x = -1


= 2(-1) - 7


= -2 - 7


= -9


(ii) -x + 2


Put x = -1


= -(-1) + 2


= 1 + 2


= 3


(iii) x2 + 2x + 1


Put x = -1


=(-1)2 + 2(-1) + 1


=1 - 2 + 1


=0


(iv)2x2 - x - 2


Put x = -1


=2(-1)2 - 1 -2


= 2(1) - 3


=2 - 3


= -1


3
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