Q. 24.4( 128 Votes )

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Answer :

(i) 4p + 7


Put p = -2


=4(-2) + 7


= -8 + 7


= -1


(ii) -3p2 + 4p + 7


Put p = -2


= -3(-2)2 + 4(-2) + 7


= -3(4) - 8 + 7


= -12 - 8 + 7

= -20 + 7

= -13


(iii) -2p3 - 3p2 + 4p + 7


Put p = -2


=-2(-2)3 - 3(-2)2 + 4(-2) + 7


= -2(-8) -3(4) - 8 + 7


= 16 -12 - 8 + 7

= 4 - 1

= 3

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