Question

can you all help me I will mark brainliest for one who will give good 50 points​

Answer 1

Answer:

Step-by-step explanation:

7) ((2/7)²)^x × (-7/2)^-1 = -8/343

: (-2/7)^2x × (-2/7)¹ = (-2/7)³

: Equating powers -> 2x + 1 = 3

-> 2x = 2

-> x = 1

8) 2^-n × 8^2n+1 × 16^2n/ = 1/16

: (2^-n) × (2^6n+3) × (2^8n)/2^6n = 2^-4

: Equating Powers -> 6n + 3 - n + 8n - 6n = -4

-> 7n + 3 = -4

-> 7n = -7

-> n = -1

Answer 2

1. Tip

To find the value of

x

for which

{(−27)2}x×(−72)−1=−8343

use the formulae below:

If

(a)p=(a)q⇒p=q

(ab)−1=ba

Explanation

Given that

{(−27)2}x×(−72)−1=−8343



To find the value of x for which

{(−27)2}x×(−72)−1=−8343

Step 1

Equate,

{(−27)2}x×(−72)−1=−8343

⇒{(−27)2}x×2−7=−8343

⇒{(−27)2}x=−8×−7343×2

⇒{449}x=449

⇒{449}x={449}1

Step 2

Apply

(a)p=(a)q⟹p=q

∴x=1

Final Answer

If

{(−27)2}x×(−72)−1=−8343

then the value of

x=1

2. for the answer to ur 8th question refer the attachment