Question

find the value of the following expression when n= -2.
a) 5n-2
b) 5n²+5n-2
c) n³+5n²+5n-2​

Answer 1

Answer:

Here is your answer .

Step-by-step explanation:

$a. \: 5( -2 ) - 2 \\ - 10 - 2 \\ = - 12 \\ \\ b. \: 5 {n}^{2} + 5n \: - 2 \\ 5 {( - 2)}^{2} + 5( - 2) - 2 \\ = 5(4) - 10 - 2 \\ = 20 - 12 \\ = 8 \\ \\ c. \: {n}^{3} + 5 {n}^{2} + 5n - 2 \\ { (- 2)}^{3} + 5 { (- 2)}^{2} + 5( - 2) - 2 \\ 8 + 5(4) - 10 - 2 \\ = 8 + 20 - 12 \\ = 28 - 12 \\ = 16$

Hope it will help you.