Question

Find the value of the following expressions when n= -2.
(i) 5n-2
(ii) 5n2 + 5n - 2
(iii) n3 +5n2 + 5n - 2​

Answer 1

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Answer 2

Answer:

i) -12

ii) 8

iii) 0

Step-by-step explanation:

i) 5n-2

=5(-2)-2

=-10-2

=-12

ii)5$n^{2}$+5n-2

=5(-2×-2)+5(-2)-2

=5(4)+(-10)-2

=20-10-2

=20-12

=8

iii)$n^{3}$+5$n^{2}$+5n-2

=(-2*-2*-2)+5(-2*-2)+5(-2)-2

=(4*-2)+5(4)+(-10)-2

=-8+20-10-2

=20-8-10-2

=20-18-2

=20-20

=0