Find the value of the following expressions when n=-2
A) 5n-2 B) 5n²+5n-2 C) n³+5n²+5n-2
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a is thr the right option
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Answer :
A) 5n - 2
(5×2) -2
10-2
8
B) 5n²+5n-2
= (5×2²) +(5×2)-2
= 5×4 + 10 -2
= 20+10-2
= 30-2
= 28
C) n³+ 5n²+5n-2
= 2³ + 5×2²+(5×2)-2
= 8+5×4+10-2
= 8+20+10-2
= 28+10-2
= 38-2
= 36
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