Question

3. Find the value of expression, if n=-2,
5 n? + 5n-2.​

Answer 1

Answer:

21.25

Step-by-step explanation:

If n = -2

then,

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

$= 5 \times {( - 2)}^{2} + \frac{5}{ {( - 2)}^{2} }$

$= 20 + \frac{5}{4}$

$= 20 + 1.25$

$= 21.25$

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Answer 2

5n = 5×(-2)

    = -10

5n-2 = 5×-2-2

        =-10-2

        =-12

answer is -12

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