Question

find g(-1) and g(2)+g(1).
$if \: g(x) = x{}^{3} + {x }^{2} - x - 2$
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Answer 1

• g(-1)= (-1)^3 + (-1)^2 - (-1) - 2

= -1+1+1-2

= 0+1-2

g(-1) = -1

• g(2) = 2^3 + 2^2 - 2 - 2

=8+4-2-2

=16-2-2

g(2) = 12

• g(1)= 1^3+1^2-1-2

=1+1-1-2

=2-1-2

g(1) =-1

• g(2) + g(1)= 12 + (-1)

=11

• Hence , 11 answer